Test Failure: Microsoft.Win32.SystemEventsTests.UserPreferenceTests.SignalsUserPreferenceEventsAsynchronously

[JulieLeeMSFT]

Summary:
UserPreferenceTests fails under jitstress2-jitstressregs.

Failed in:

• runtime-coreclr libraries-jitstress2-jitstressregs 20260314.1

Console Log: Console Log

Failed tests:

- net11.0-windows-Release-arm64-jitstress2_jitstressregs4-Windows.11.Arm64.Open
  - Microsoft.Win32.SystemEventsTests.UserPreferenceTests.SignalsUserPreferenceEventsAsynchronously

Error Message:

    Microsoft.Win32.SystemEventsTests.UserPreferenceTests.SignalsUserPreferenceEventsAsynchronously(message: 26, uiAction: 71, area: null, expectedCategory: Accessibility) [FAIL]
      Assert.Equal() Failure: Values differ
      Expected: Accessibility
      Actual:   General

Stack Trace:

        /_/src/libraries/Microsoft.Win32.SystemEvents/tests/SystemEvents.UserPreference.cs(152,0): at Microsoft.Win32.SystemEventsTests.UserPreferenceTests.SignalsUserPreferenceEventsAsynchronously(Int32 message, Int32 uiAction, String area, UserPreferenceCategory expectedCategory)
           at InvokeStub_UserPreferenceTests.SignalsUserPreferenceEventsAsynchronously(Object, Span`1)
        /_/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.cs(136,0): at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

Analysis:
Async user preference events have timing sensitivity under JIT stress.

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