'Project:Name' Qt Creator variable is inconsistent for cmake projects

Hey.
To facilitate backups I keep my builds outside the projects directory.
The 'Default build directory' settings has the value of

wherever_one_wants/builds/%{Project:Name}/%{Kit:FileSystemName}-%{BuildConfig:Name}

I go into Qt examples, grab the windowsflags example and put it into my projects directory.
I rename the windowsflags folder into testwindowsflags.

qmake based projects work just fine. I open it in Qt Creator, configure it and builds go to

wherever_one_wants/builds/windowflags/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug

just as expected.

But when I open CMakeLists.txt Qt Creator suggests in the 'Configure Project' pane that the project name is testwindowsflags after its folder name despite what the project file says.

# CMakeLists.txt
project(windowflags LANGUAGES CXX)

# builds go to
wherever_one_wants/builds/testwindowflags/Desktop_Qt_6_8_3_MSVC2022_64bit-Debug 

Even the editor shows the name wrong for a short time while the project is loading. It only changes later when the configuration is parsed and all set.