Create a Qt 5 general project in QDS and export it with the "Enable Automatic CMake Generation" option.

Then, use Qt Creator to open it(CMakeLists.txt) with the Qt 5.15.17 Kit.

You'll find that the configuration process returns an error and it appears that Qt 6 is designated in the CMakeLists.txt.

The problem can be observed under Windows and Mac OS, not tested in Linux yet.