Wrongly autodetect of MinGW 32/64 bit

When I have choosed the MinGW 7.3.0 for both 32/64 bit, then QtC wrongly autodetect a paths to this compilers.

A real paths are:

• c:\Qt-meta\Tools\mingw730_32\ - for 32 bit
• c:\Qt-meta\Tools\mingw730_64\ - for 64 bit

But from QtC->Tools->Options->Compilers I see that QtC take only the 'c:\Qt-meta\Tools\mingw730_64\' path and interpret it as a 32-bit compiler (please see screenshoots)!

And then e.g. compilation of QBS's 'app-and-lib' example with using of an auto-detected Kit fails with following errors:

...

C:/Qt-meta/Tools/mingw730_64/bin/../lib/gcc/x86_64-w64-mingw32/7.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: skipping incompatible C:/Qt-meta/Tools/mingw730_64/bin/../lib/gcc/x86_64-w64-mingw32/7.3.0/libstdc++.dll.a when searching for -lstdc++

...