Many WasmTestOnChrome-MONO-ST tests failing unable to load dotnet.*.js

[ericstj]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1389851
Build error leg or test failing: WasmTestOnChrome-MONO-ST-Common.Tests.WorkItemExecution
Pull request: #127236

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "MONO_WASM: Failed to fetch dynamically imported module: ",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Example log https://helixr1107v0xdcypoyl9e7f.blob.core.windows.net/dotnet-runtime-refs-pull-127200-merge-e70fc8e5593f46358a/WasmTestOnChrome-MONO-ST-Common.Tests/1/console.686d5c1e.log

Also seeing in rolling build of main https://dev.azure.com/dnceng-public/public/_build/results?buildId=1389987&view=results

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1389851
Error message validated: [MONO_WASM: Failed to fetch dynamically imported module: ]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 4/22/2026 1:25:23 AM UTC

Report

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	0

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[lewing]

Caused by #126407

cc @maraf

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Tagging subscribers to 'arch-wasm': @lewing, @pavelsavara
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[vitek-karas]

Fixed by #127286