Test coverage consistently hangs (deadlocks?) on two separate computers. I realized one computer has Rider 2021.3.2 and the other has Rider 2021.3.1. It's not always the same tests that it gets stuck on and if I remove the ones it gets stuck on (after restarting Rider) it will get stuck somewhere else instead.Choosing "Run Tests" works fine and everything passes. Choosing "Debug Tests" works fine as well. Only "Cover Tests" causes the hang. Something underneath does not recover from stopping the unit test session and the IDE no longer functions with repeated "Creating Backend Thread Dump" messages every 10 seconds or so.
It does "seem" like it tends to get stuck on Windows Forms related tests and not more "pure" tests, but it's hard to say for sure; there's no indication what it is stuck on or why it is stuck and this only happens for coverage, the tests otherwise pass fine. (So far Run Tests has never hung, and Cover Tests has always hung, as long as I run enough tests. I can cover a single test at a time with no issues, even the ones it was stuck on. This is why it seems like a deadlock or something but who knows.)