[ci-scan] Test failure: System.Diagnostics.Tests.FileVersionInfoTest.FileVersionInfo_CustomManagedAssembly on Apple NativeAOT

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Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1494308
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_NativeAOT - System.Diagnostics.FileVersionInfo.Tests

Error Details

On the Apple NativeAOT library-test legs (iossimulator / maccatalyst AllSubsets_NativeAOT), FileVersionInfo_CustomManagedAssembly fails when it opens its companion managed assembly by file path. Under NativeAOT the System.Diagnostics.FileVersionInfo.TestAssembly.dll is not present as a loadable file in the app bundle, so the test throws FileNotFoundException:

[FAIL] System.Diagnostics.Tests.FileVersionInfoTest.FileVersionInfo_CustomManagedAssembly
System.IO.FileNotFoundException : .../System.Diagnostics.FileVersionInfo.Tests.app/System.Diagnostics.FileVersionInfo.TestAssembly.dll

The harness runs and the individual test fails, so this is distinct from the harness-startup crash tracked by #130219 (mono_ios_set_summary MarshalDirectiveException on the tvos device leg). NativeAOT library tests on Apple mobile were newly enabled by #125437 (merged 2026-07-02). A previously-closed report covering a different failure mode of the same test (Mono aggressive-trimming .dll/.exe mismatch) is #126882.

Observed on source build 1494308 (State=Failed) and again on follow-up build 1494829; reproduces across the iossimulator and maccatalyst NativeAOT legs.

Related: #130219

Error Message

{
  "ErrorMessage": [
    "[FAIL] System.Diagnostics.Tests.FileVersionInfoTest.FileVersionInfo_CustomManagedAssembly",
    "System.Diagnostics.FileVersionInfo.TestAssembly.dll"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

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Summary

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