TryDuplicateBadTab and TryDuplicateBadPane unit tests are hanging when run locally

[j4james]

Environment

Windows build number: Version 10.0.18362.657
Windows Terminal version (if applicable): Commit 28d108b

Steps to reproduce

1. Build the OpenConsole solution from a recent commit
2. Run the unit test with runut.cmd /name:*TabTests::TryDuplicate*

Expected behavior

The unit tests should execute successfully.

Actual behavior

The TestHostApp window opens up and the test then appears to be stuck. Closing the window manually doesn't help, but if you instead kill the TestHostApp process, it will at least continue with the rest of the tests.

[zadjii-msft]

That's not what you want to hear 😞. I wonder when this regressed - I'd bet it's the combo of #5051 with #5090, but I can't be sure ATM