xunit.v3 tests under debug don't pause at breakpoint

[aggieben]

Describe the bug

In an F♯ project being tested via xunit.v3 (tests also written in F♯), breakpoints aren't respected. The test runs with correct output, the debugger attaches to the running test process and shows some threads, but breakpoints aren't hit. When the test starts, my breakpoint goes empty/gray like you expect, and then it seems to get resolved (turns back red), and it even moves a line because of where executable code is, but it never actually pauses execution.

This was working with xunit v2, but I have no idea what the difference is as it might pertain to the debugger.

Expected behaviour

The debugger pauses execution on a breakpoint as expected

Machine info

• OS: Windows 11
• .NET SDK version: [e.g. 8.0.403]
• Ionide version: 7.21.2

I'm happy to gather whatever information might be useful; I just can't post the complete sources.