Thanks for the reply. I can confirm it still occurs on my app as well with 11.3.1. It seems like OpenGL got broken and I don't know if Apple has any desire to fix it as it was marked deprecated.

If anything this is getting worse with subsequent releases of Xcode. I crash just stepping over code in C\++ on my M1 Mac Mini now running Xcode 12.4 (12D4e) on Big Sur (11.2 20D6). I submitted my most recent set of crash logs with feedback #FB8983057. Would really love to be able to use the debugger for C++ projects again.