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Mystery resolved: opencv throws and catches an exception internally. Enabling the flag <all c++="" exceptions="" not="" in="" this="" list=""> (in "C++ Exceptions" in Visual Studio 2019) makes VS catch it even though it's within try-catch block. I don't know if it's by design, but changing that flag (it is disabled by default) seems to be cause and the solution of the problem.

Mystery resolved: opencv throws and catches an exception internally. Enabling the flag <all c++="" exceptions="" not="" in="" this="" list=""><All C++ Exceptions not in this list> (in "C++ Exceptions" in Visual Studio 2019) makes VS catch it even though it's within try-catch block. I don't know if it's by design, but changing that flag (it is disabled by default) seems to be cause and the solution of the problem.