The problematic test appears to be:
NUnit.Engine.Runners.Tests.TestEngineRunnerTests<LocalTestRunner>.RunAsync
Suspect this might be a side-effect of the async changes in Framework 3.12. @jnm2, if you get a minute, mind having a quick nose, and seeing if you have any ideas? I very much don't have your level of async knowledge here! 馃檪
No urgency - the engine can stay on framework 3.11 for now. It just caught me out while I was upgrading other things.
I can't think of anything, but I will sure look into it this weekend and let you know.
Awesome, thank you! No major urgency - I just encountered this when trying to get PlatformAttribute for the .NET Core Console tests - which is only in v3.12. I just worked around it instead. 馃檪
Never diagnosed this, but I've just upgraded the Framework to the most recent master build for the .NET 5.0 fixes, and that works fine. 馃檪