### Issue Description These tests seem to be flaky: <img width="631" alt="image" src="https://user-images.githubusercontent.com/4691428/153958293-8fc794fd-4265-4069-b8a7-273bc21bab96.png"> This exact same set of tests failed on both the [UsingTask Override PR](https://github.com/dotnet/msbuild/pull/6783) and the [netstandard2.0 to net6.0 upgrade PR](https://github.com/dotnet/msbuild/pull/6148). A rerun fixed the issue.
Issue Description
These tests seem to be flaky:
This exact same set of tests failed on both the UsingTask Override PR and the netstandard2.0 to net6.0 upgrade PR.
A rerun fixed the issue.