It's a bug with dyld.
https://developer.apple.com/forums/thread/679098
Apple, pay attention on this. We can't debug in Xcode.
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Same trouble on OSx 11.3.1 Xcode 12.2 (12B45b) on Simulator with iOS 14.2
Apple, please fix this bug. It restricts debugging during development. it's critical issue.
@_whatthedeuce It doesn't help unfortunately. Still have trouble with attaching debugger and slow running time.