System.Diagnostics.Tests.ProcessTests.TestExited_SynchronizingObject(invokeRequired: True) failed in CI

[ViktorHofer]

System.Diagnostics.Tests.ProcessTests.TestExited_SynchronizingObject(invokeRequired: True)

https://dev.azure.com/dnceng/public/_build/results?buildId=677964&view=ms.vss-test-web.build-test-results-tab&runId=21000924&resultId=156183&paneView=debug

Configuration: net5.0-Linux-Debug-x64-CoreCLR_release-Debian.9.Amd64.Open

Assert.NotNull() Failure
   at System.Diagnostics.Tests.ProcessTests.TestExited_SynchronizingObject(Boolean invokeRequired) in /_/src/libraries/System.Diagnostics.Process/tests/ProcessTests.cs:line 162

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