[ci-scan] Test failure: browser-wasm R2R genericsload asserts bIsFlatLayoutSuitable (callgenericctor/usegenericfield) #131842

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1539176
Build error leg or test failing: coreclr Pri1 Runtime Tests Run browser wasm checked - readytorun/tests/genericsload/callgenericctor and usegenericfield
Reproduces in the follow-up build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1539724

Error Details

The browser-wasm Checked CoreCLR runtime aborts with a native assert while loading a ReadyToRun image, failing the callgenericctor and usegenericfield R2R tests:

14:09:53.672 Running test: readytorun/tests/genericsload/callgenericctor/callgenericctor.cmd
ASSERT FAILED
	Expression: bIsFlatLayoutSuitable
	Location:   src/coreclr/vm/peimage.cpp:656
	Function:   GetOrCreateLayoutInternal
	Process:    42

PEImage::GetOrCreateLayoutInternal is reached without LAYOUT_FLAT being permitted, even though WebAssembly defines PEIMAGE_FLAT_LAYOUT_ONLY. This is the same underlying flat-layout limitation described in the area-team tracker #131767.

Tracking: #131767

Error Message

{
  "ErrorMessage": [
    "Expression: bIsFlatLayoutSuitable",
    "peimage.cpp:656",
    "Function:   GetOrCreateLayoutInternal"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Filed by ci-failure-scan (detection only). ci-failure-fix walks open [ci-scan] KBEs and either opens a small fix PR or comments here to loop in owners — it never disables the test.

network:
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    - "awmgmcpg"

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