MSVC C++ runtime bug in dynamic_cast, C++ (vc++)

MSVC C++ runtime bug in dynamic_cast

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Compilation time: 1,56 sec, absolute running time: 0,34 sec, absolute service time: 1,9 sec

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Warning(s):

source_file.cpp(7): warning C4584: 'Class7': base-class 'Class2' is already a base-class of 'Class4'
source_file.cpp(4): note: see declaration of 'Class2'
source_file.cpp(6): note: see declaration of 'Class4'
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

dynamic_cast gives 000000912AA9FE58, should be nullptr

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