diff --git a/internal/compatibility/generated/node-v24-internal.json b/internal/compatibility/generated/node-v24-internal.json
index 961b40bd4..3da043d37 100644
--- a/internal/compatibility/generated/node-v24-internal.json
+++ b/internal/compatibility/generated/node-v24-internal.json
@@ -54790,6 +54790,7 @@
           "tests/corpus/2988-http-static-client-abort.ts",
           "tests/corpus/net-paused-socket-exit.cjs",
           "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-socket-set-encoding-names.ts",
           "tests/corpus/net-socket-write-rejected.cjs",
@@ -56346,7 +56347,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -56434,7 +56436,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -59466,6 +59469,7 @@
           "tests/corpus/2689-http-server-timeout-properties.ts",
           "tests/corpus/net-paused-socket-exit.cjs",
           "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-socket-set-encoding-names.ts",
           "tests/corpus/net-socket-write-rejected.cjs"
@@ -61731,7 +61735,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       },
       "anchorSource": "exact"
@@ -62044,7 +62049,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       },
       "anchorSource": "exact"
@@ -63875,6 +63881,7 @@
           "tests/corpus/2689-http-server-timeout-properties.ts",
           "tests/corpus/net-paused-socket-exit.cjs",
           "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-socket-set-encoding-names.ts",
           "tests/corpus/net-socket-write-rejected.cjs"
@@ -63978,7 +63985,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -64079,7 +64087,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -72076,6 +72085,7 @@
           "tests/corpus/5659-net-blocklist-socketaddress.ts",
           "tests/corpus/net-paused-socket-exit.cjs",
           "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-socket-set-encoding-names.ts",
           "tests/corpus/net-socket-write-rejected.cjs",
@@ -72692,7 +72702,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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@@ -72719,7 +72730,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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@@ -72782,7 +72794,8 @@
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           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -72809,7 +72822,8 @@
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           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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@@ -72836,7 +72850,8 @@
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           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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@@ -72863,7 +72878,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       },
       "anchorSource": "exact"
@@ -72890,7 +72906,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -73238,7 +73255,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -73283,7 +73301,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -73310,7 +73329,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -73376,7 +73396,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -73403,7 +73424,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -73502,7 +73524,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -73586,7 +73609,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -74235,7 +74259,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -74262,7 +74287,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -74289,7 +74315,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -74316,7 +74343,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -74343,7 +74371,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -74370,7 +74399,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -74397,7 +74427,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -74424,7 +74455,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -74451,7 +74483,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       "anchorSource": "exact"
@@ -74514,7 +74547,8 @@
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           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       },
       "anchorSource": "exact"
@@ -74541,7 +74575,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
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       },
       "anchorSource": "exact"
@@ -76000,6 +76035,7 @@
           "tests/corpus/6397-event-loop-metrics.ts",
           "tests/corpus/net-paused-socket-exit.cjs",
           "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-socket-set-encoding-names.ts",
           "tests/corpus/net-socket-write-rejected.cjs",
@@ -76311,7 +76347,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -96254,6 +96291,7 @@
           "tests/corpus/7442-tls-server-contexts.mjs",
           "tests/corpus/net-paused-socket-exit.cjs",
           "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-socket-set-encoding-names.ts",
           "tests/corpus/net-socket-write-rejected.cjs",
@@ -96666,7 +96704,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -96698,7 +96737,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
@@ -96753,7 +96793,8 @@
           "tests/corpus/net-socket-write-rejected.cjs",
           "tests/corpus/net-socket-method-values.cjs",
           "tests/corpus/net-paused-socket-exit.cjs",
-          "tests/corpus/net-server-socket-peer-close.cjs"
+          "tests/corpus/net-server-socket-peer-close.cjs",
+          "tests/corpus/net-socket-encoding-pipe.cjs"
         ]
       },
       "anchorSource": "exact"
diff --git a/internal/compatibility/static-support.json b/internal/compatibility/static-support.json
index 2d74d4de5..50d41994e 100644
--- a/internal/compatibility/static-support.json
+++ b/internal/compatibility/static-support.json
@@ -479,7 +479,7 @@
     { "symbols": ["setImmediate", "setInterval", "setTimeout", "clearImmediate", "clearInterval", "clearTimeout", "timersPromises.setTimeout", "timersPromises.setImmediate", "timersPromises.setInterval", "immediate.hasRef", "immediate.ref", "immediate.unref", "timeout.hasRef", "timeout.ref", "timeout.unref", "timeout.refresh"], "status": "partial", "evidence": ["tests/corpus/1804-timers-module.ts", "tests/corpus/1805-timer-callback-args.ts", "tests/corpus/2093-timers-promises.ts", "tests/corpus/2852-timers-promises-interval.ts", "tests/corpus/5830-timers-promises-signal.ts"] },
     { "symbols": ["timersPromises.scheduler.wait", "timersPromises.scheduler.yield"], "status": "partial", "evidence": ["tests/corpus/5839-timers-promises-scheduler.ts", "tests/corpus/5889-timers-scheduler-signal.ts"] },
     { "symbols": ["stream.finished", "stream.pipeline", "stream.getDefaultHighWaterMark", "readable.push", "readable.unshift", "readable.read", "readable.pause", "readable.resume", "readable.isPaused", "readable.setEncoding", "readable.pipe", "readable.unpipe", "readable.destroy", "writable.write", "writable.end", "writable.cork", "writable.uncork", "writable.setDefaultEncoding"], "status": "partial", "evidence": ["tests/corpus/1685-stream-readable-basics.ts", "tests/corpus/1688-stream-writable-basics.ts", "tests/corpus/1814-stream-pipeline.cjs", "tests/corpus/5302-stream-promises-options.ts", "tests/corpus/5303-stream-finished-callback-opts.cjs", "tests/corpus/5425-pipeline-generator-stage.ts", "tests/corpus/5428-pipeline-generator-stages.cjs", "tests/corpus/5617-pipeline-function-ends.ts", "tests/corpus/5619-pipeline-function-ends.cjs", "tests/corpus/writable-error-callbacks.ts"] },
-    { "symbols": ["net.createServer", "net.connect", "net.createConnection", "net.getDefaultAutoSelectFamilyAttemptTimeout", "net.setDefaultAutoSelectFamilyAttemptTimeout", "server.address", "server.close", "server.listen", "socket.destroy", "socket.end", "socket.pause", "socket.resume", "socket.setEncoding", "socket.setTimeout", "socket.write"], "status": "partial", "evidence": ["tests/corpus/2500-net-autosel-timeout.ts", "tests/corpus/2596-net-arg-ladders.cjs", "tests/corpus/net-socket-set-encoding-names.ts", "tests/corpus/net-socket-write-rejected.cjs", "tests/corpus/net-socket-method-values.cjs", "tests/corpus/net-paused-socket-exit.cjs", "tests/corpus/net-server-socket-peer-close.cjs"] },
+    { "symbols": ["net.createServer", "net.connect", "net.createConnection", "net.getDefaultAutoSelectFamilyAttemptTimeout", "net.setDefaultAutoSelectFamilyAttemptTimeout", "server.address", "server.close", "server.listen", "socket.destroy", "socket.end", "socket.pause", "socket.resume", "socket.setEncoding", "socket.setTimeout", "socket.write"], "status": "partial", "evidence": ["tests/corpus/2500-net-autosel-timeout.ts", "tests/corpus/2596-net-arg-ladders.cjs", "tests/corpus/net-socket-set-encoding-names.ts", "tests/corpus/net-socket-write-rejected.cjs", "tests/corpus/net-socket-method-values.cjs", "tests/corpus/net-paused-socket-exit.cjs", "tests/corpus/net-server-socket-peer-close.cjs", "tests/corpus/net-socket-encoding-pipe.cjs"] },
     { "symbols": ["dgram.createSocket", "socket.address", "socket.bind", "socket.close", "socket.connect", "socket.ref", "socket.remoteAddress", "socket.send", "socket.unref"], "status": "partial", "evidence": ["tests/corpus/2597-dgram-send-ladders.cjs"] },
     { "symbols": ["net.SocketAddress", "net.BlockList"], "status": "partial", "evidence": ["tests/corpus/5659-net-blocklist-socketaddress.ts", "tests/fixtures/node-types/net-blocklist.ts"] },
     { "symbols": ["SocketAddress.parse", "BlockList.isBlockList", "blockList.addAddress", "blockList.addAddresses", "blockList.addCIDR", "blockList.addCIDRs", "blockList.addRange", "blockList.addSubnet", "blockList.check", "blockList.clear", "blockList.fromJSON", "blockList.removeAddress", "blockList.removeCIDR", "blockList.removeRange", "blockList.removeSubnet", "blockList.toJSON"], "status": "supported", "evidence": ["tests/corpus/5659-net-blocklist-socketaddress.ts", "tests/fixtures/node-types/net-blocklist.ts"] },
diff --git a/packages/compiler/test/ts7/baselines/order-parity/tests/corpus/net-socket-encoding-pipe.cjs.json b/packages/compiler/test/ts7/baselines/order-parity/tests/corpus/net-socket-encoding-pipe.cjs.json
new file mode 100644
index 000000000..59d8f4e80
--- /dev/null
+++ b/packages/compiler/test/ts7/baselines/order-parity/tests/corpus/net-socket-encoding-pipe.cjs.json
@@ -0,0 +1,6 @@
+{
+ "order": [
+  "<repo>/tests/corpus/net-socket-encoding-pipe.cjs"
+ ],
+ "diags": []
+}
diff --git a/packages/runtime/src/scr_net.c b/packages/runtime/src/scr_net.c
index 2c9793d0b..92fd7c9f1 100644
--- a/packages/runtime/src/scr_net.c
+++ b/packages/runtime/src/scr_net.c
@@ -1562,6 +1562,19 @@ static void scr_net_sock_fire_data(ScrNetSocket *s, ScrBytes *chunk, ScrStr *tex
   scr_bytes_release(empty);
 }
 
+/* One decoded 'data' string after setEncoding: the pipe destination
+ * writes it, as Node's pipe writes the string chunk (UTF-8), and the
+ * 'data' listeners receive it. */
+static void scr_net_sock_emit_text(ScrNetSocket *s, ScrStr *text) {
+  if (s->pipe_dst) {
+    char *owned;
+    const char *bytes = scr_str_utf8(text, &owned);
+    scr_net_sock_write_raw(s->pipe_dst, bytes, text->len);
+    scr_str_utf8_end(owned);
+  }
+  if (s->data_ls.n > 0) scr_net_sock_fire_data(s, NULL, text);
+}
+
 /* EOF: 'end' fires now (directly — Node's poll-phase emit), then the
  * write half ends (allowHalfOpen false), and the fd closes once the FIN
  * is out. 'close' waits for the sweep. */
@@ -1573,6 +1586,15 @@ static void scr_net_sock_eof(ScrNetSocket *s) {
     s->native_eof(s->native_ctx);
     if (scr_exc_pending()) return;
   }
+  if (s->encoding != NULL && (s->data_ls.n > 0 || s->pipe_dst != NULL)) {
+    /* the decoder's end(): a held partial sequence is the last 'data',
+     * and the pipe destination receives it before its end() */
+    ScrStr *tail = scr_strdec_end(s->encoding, s->dec_pending);
+    s->dec_pending = 0;
+    if (tail->len > 0) scr_net_sock_emit_text(s, tail);
+    scr_str_release(tail);
+    if (scr_exc_pending()) return;
+  }
   if (s->pipe_dst) {
     /* pipe's end-the-destination default */
     ScrNetSocket *dst = s->pipe_dst;
@@ -1581,14 +1603,6 @@ static void scr_net_sock_eof(ScrNetSocket *s) {
       scr_net_sock_maybe_finish_write(dst);
     }
   }
-  if (s->encoding != NULL && s->data_ls.n > 0) {
-    /* the decoder's end(): a held partial sequence is the last 'data' */
-    ScrStr *tail = scr_strdec_end(s->encoding, s->dec_pending);
-    s->dec_pending = 0;
-    if (tail->len > 0) scr_net_sock_fire_data(s, NULL, tail);
-    scr_str_release(tail);
-    if (scr_exc_pending()) return;
-  }
   scr_net_fire0_this(&s->end_ls, s, SCR_DYNH_NET_SOCKET);
   if (scr_exc_pending()) return;
   if (!s->wr_ending) {
@@ -1611,21 +1625,25 @@ static bool scr_net_sock_deliver(ScrNetSocket *s, const char *buf, size_t n) {
      * next chunk takes the listener path */
     return true;
   }
+  if (s->encoding != NULL && (s->pipe_dst != NULL || s->data_ls.n > 0)) {
+    /* the decoder answers the complete characters; a partial sequence
+     * waits for the next chunk, and an empty answer emits nothing */
+    ScrBytes *chunk = scr_bytes_new(SCR_BYTES_U8, (double)n);
+    chunk->is_buffer = true;
+    memcpy(chunk->data, buf, n);
+    ScrStr *text = scr_strdec_write(s->encoding, s->dec_pending, chunk);
+    s->dec_pending = scr_strdec_next(s->encoding, s->dec_pending, chunk);
+    scr_bytes_release(chunk);
+    if (text->len > 0) scr_net_sock_emit_text(s, text);
+    scr_str_release(text);
+    return !scr_exc_pending();
+  }
   if (s->pipe_dst) scr_net_sock_write_raw(s->pipe_dst, buf, n);
   if (s->data_ls.n > 0) {
     ScrBytes *chunk = scr_bytes_new(SCR_BYTES_U8, (double)n);
     chunk->is_buffer = true; /* Node delivers a Buffer */
     memcpy(chunk->data, buf, n);
-    if (s->encoding != NULL) {
-      /* the decoder answers the complete characters; a partial sequence
-       * waits for the next chunk, and an empty answer emits nothing */
-      ScrStr *text = scr_strdec_write(s->encoding, s->dec_pending, chunk);
-      s->dec_pending = scr_strdec_next(s->encoding, s->dec_pending, chunk);
-      if (text->len > 0) scr_net_sock_fire_data(s, NULL, text);
-      scr_str_release(text);
-    } else {
-      scr_net_sock_fire_data(s, chunk, NULL);
-    }
+    scr_net_sock_fire_data(s, chunk, NULL);
     scr_bytes_release(chunk);
     if (scr_exc_pending()) return false;
   }
diff --git a/tests/corpus/net-socket-encoding-pipe.cjs b/tests/corpus/net-socket-encoding-pipe.cjs
new file mode 100644
index 000000000..ff81151d9
--- /dev/null
+++ b/tests/corpus/net-socket-encoding-pipe.cjs
@@ -0,0 +1,44 @@
+// socket.pipe(destination) after socket.setEncoding(enc) writes the
+// decoded strings to the destination, as Node's pipe writes each string
+// chunk: the destination receives their UTF-8 bytes, a split character
+// arrives whole, and a partial character held at EOF is written before the
+// destination ends.
+"use strict";
+const net = require("net");
+
+const source = net.createServer((socket) => {
+  socket.on("error", () => {});
+  socket.write(Buffer.from([0x61, 0xc3]));
+  setTimeout(() => socket.end(Buffer.from([0xa9, 0x62, 0xe2, 0x82])), 50);
+});
+
+const received = new Map();
+const collector = net.createServer((socket) => {
+  const chunks = [];
+  let label = null;
+  socket.on("data", (chunk) => chunks.push(chunk));
+  socket.on("end", () => {
+    const all = Buffer.concat(chunks);
+    const newline = all.indexOf(0x0a);
+    label = all.subarray(0, newline).toString();
+    received.set(label, all.subarray(newline + 1).toString("hex"));
+    if (received.size === encodings.length) {
+      for (const name of encodings) console.log(name, received.get(name));
+      source.close();
+      collector.close();
+    }
+  });
+});
+
+const encodings = ["utf8", "hex", "base64", "latin1", "ucs2"];
+source.listen(0, "127.0.0.1", () => {
+  collector.listen(0, "127.0.0.1", () => {
+    for (const encoding of encodings) {
+      const destination = net.connect(collector.address().port, "127.0.0.1");
+      destination.write(encoding + "\n");
+      const client = net.connect(source.address().port, "127.0.0.1");
+      client.setEncoding(encoding);
+      client.pipe(destination);
+    }
+  });
+});
diff --git a/tests/harness/corpus-costs/net-socket-encoding-pipe.cjs.json b/tests/harness/corpus-costs/net-socket-encoding-pipe.cjs.json
new file mode 100644
index 000000000..030fd6454
--- /dev/null
+++ b/tests/harness/corpus-costs/net-socket-encoding-pipe.cjs.json
@@ -0,0 +1 @@
+{ "plain": 2100, "san": 3200 }
diff --git a/tests/harness/node-parallel-runner.test.ts b/tests/harness/node-parallel-runner.test.ts
index 9caebd258..22c44f39d 100644
--- a/tests/harness/node-parallel-runner.test.ts
+++ b/tests/harness/node-parallel-runner.test.ts
@@ -59,3 +59,50 @@ test("a relative --node path links the checkout's fixtures and common helpers in
     );
   expect(existsSync(join(out, "tree", "test", "common", "tmpdir.js"))).toBe(true);
 });
+
+test("concurrent files get their own test/common tmpdir", () => {
+  const checkout = join(scratch, "node-tmpdir");
+  mkdirSync(join(checkout, "test", "parallel"), { recursive: true });
+  mkdirSync(join(checkout, "test", "fixtures"), { recursive: true });
+  mkdirSync(join(checkout, "test", "common"), { recursive: true });
+  for (const helper of ["fixtures.js", "dns.js", "internet.js"])
+    writeFileSync(join(checkout, "test", "common", helper), "module.exports = {};\n");
+  // Each file refreshes the tmpdir, writes a marker and reads it back after
+  // the other file has refreshed its own: with a shared directory the
+  // marker is gone and the file exits with 1.
+  const body = `const fs = require("fs");
+const tmpdir = require("../common/tmpdir");
+tmpdir.refresh();
+fs.writeFileSync(tmpdir.resolve("marker"), __filename);
+setTimeout(() => {
+  process.exit(fs.existsSync(tmpdir.resolve("marker")) ? 0 : 1);
+}, 500);
+`;
+  for (const name of ["test-tmp-a.js", "test-tmp-b.js"])
+    writeFileSync(join(checkout, "test", "parallel", name), body);
+  const failingCli = join(scratch, "failing-cli.mjs");
+  writeFileSync(failingCli, "process.exit(1);\n");
+  const out = join(scratch, "out-tmpdir");
+  const result = spawnSync(
+    process.execPath,
+    [
+      join(repo, "tests/node-parallel/run.mjs"),
+      "--node",
+      checkout,
+      "--pattern",
+      "^test-tmp-",
+      "--out",
+      out,
+      "--cli",
+      failingCli,
+      "--jobs",
+      "2",
+    ],
+    { cwd: scratch, encoding: "utf8" },
+  );
+  expect(result.status, result.stderr).toBe(0);
+  const results = JSON.parse(readFileSync(join(out, "results.json"), "utf8")) as {
+    nodeExit: number;
+  }[];
+  expect(results.map((r) => r.nodeExit)).toEqual([0, 0]);
+});
diff --git a/tests/node-parallel/README.md b/tests/node-parallel/README.md
index f24f6b29e..664ee41cc 100644
--- a/tests/node-parallel/README.md
+++ b/tests/node-parallel/README.md
@@ -18,6 +18,6 @@ Options:
 - `--cli`: the scriptc CLI entry (default `packages/cli/dist/main.js`).
 - `--jobs`: concurrent files (default 4).
 
-Node runs each file with its `// Flags:` line. Results are written to `<out>/results.json` and `<out>/results.md`.
+Node runs each file with its `// Flags:` line. Each job runs its files with its own `TEST_THREAD_ID`, as Node's test runner does, so `test/common/tmpdir` gives concurrent files different directories. Results are written to `<out>/results.json` and `<out>/results.md`.
 
 Before a lane relies on the minimal common, run its files under Node in `<out>/tree/test/parallel`: they should all pass there.
diff --git a/tests/node-parallel/run.mjs b/tests/node-parallel/run.mjs
index dee37c10f..02f967034 100644
--- a/tests/node-parallel/run.mjs
+++ b/tests/node-parallel/run.mjs
@@ -89,11 +89,14 @@ const firstCause = (text) =>
     .trim()
     .slice(0, 300);
 
-async function one(file) {
+// Each job runs its files with its own TEST_THREAD_ID, as Node's test runner
+// does, so test/common/tmpdir gives concurrent files different directories.
+async function one(file, job) {
+  const env = { ...process.env, TEST_THREAD_ID: String(job) };
   const dir = join(testRoot, "parallel");
   const source = readFileSync(join(dir, file), "utf8");
   const flags = (/^\/\/ Flags: (.*)$/m.exec(source)?.[1] ?? "").split(/\s+/).filter(Boolean);
-  const node = await run(process.execPath, [...flags, file], { cwd: dir, timeout: 120_000 });
+  const node = await run(process.execPath, [...flags, file], { cwd: dir, env, timeout: 120_000 });
   const exe = join(out, "bin", `${file}.exe`);
   mkdirSync(join(out, "bin"), { recursive: true });
   const build = await run(process.execPath, [values.cli, "build", file, "-o", exe], {
@@ -106,7 +109,7 @@ async function one(file) {
     result.cause = firstCause(build.stdout + build.stderr);
     return result;
   }
-  const native = await run(exe, [], { cwd: dir, timeout: 120_000 });
+  const native = await run(exe, [], { cwd: dir, env, timeout: 120_000 });
   result.exit = termination(native);
   result.verdict = sameTermination(node, native) ? "pass" : "fail";
   if (result.verdict !== "pass") result.cause = firstCause(native.stderr + native.stdout);
@@ -116,9 +119,9 @@ async function one(file) {
 const results = [];
 const queue = [...files];
 await Promise.all(
-  Array.from({ length: Number(values.jobs) }, async () => {
+  Array.from({ length: Number(values.jobs) }, async (_, job) => {
     for (let file = queue.shift(); file !== undefined; file = queue.shift()) {
-      const result = await one(file);
+      const result = await one(file, job);
       results.push(result);
       console.log(`${result.verdict.padEnd(8)} ${file}${result.cause ? `  ${result.cause}` : ""}`);
     }