"Build All Projects for All Configurations" doesn't work for cmake projects

Steps to reproduce:

New File or Project | Application (Qt) | Qt Widgets Application, on "Build System" page I choose cmake, on Kits page I select qt 5.15 and qt 6 (the rest of wizard pages I accept the defaults). Then I do "Build All Projects for All Configurations" and I'm getting:

11:44:24: Configuration is faulty. Check the Issues view for details.
Error while building/deploying project untitled17 (kit: Qt 5.15.0 (qt-515-build))
When executing step "CMake Build"

The issues page shows: :-1: error: The build configuration is currently disabled.

However, if I do "Build All Projects" everything builds fine. If I switch the active build configuration to use qt 6, "Build All Projects" also works fine.

Please note, that if I generate the project for "qmake" (instead of cmake), "Build All Projects for All Configurations" works fine.