Hi @Andrzej ,
Welcome to Microsoft Q&A!
Do you have any error message or warning when the breakpoint doesn’t work? Are you debugging your test project in Debug or Release mode?
If it is in Release mode, the breakpoints will not be hit. Please disable Just My Code and try again.
Besides, you can try to delete the .vs folder in your project folder and try again.
Sincerely,
Anna
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