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Bug
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    Resolution: Incomplete
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  Not Evaluated                     
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    None
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    Qt Creator 6.0.1
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    None
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    Windows 10, Visual C++ 2019.
 
- Set a few breakpoints.
 - Start debugging.
 - After the first breakpoint hit, just try to continue the app execution. Result: error message is displayed. Impossible to continue.
 

Addition #1. OK, it seems I've understood the reason. Qt 5.12.12 MSVC2017 32bit kit was selected. Works fine for 64bit kit.