qt_add_qml_module causes recompile without any changes

[nxctr]

Using qt_add_qml_module causes a recompile even if no changes have been made if it contains C++ files.
You can try it here:

cmake -S /opt/Qt/Examples/Qt-6.5.1/bluetooth/heartrate-game -B build
cmake --build build
cmake --build build

Remove qt_add_qml_module and it doesn't run (obviously), but it doesn't recompile every QML file even when no changes have been made.
Does anyone know a workaround? This is making it hard to develop large applications.