QML debugging enabled by default in a CMake project but doesn't start until option rechecked

For example a new CMake project created in Qt Creator would have by default "Enable QML" enabled in debugger settings (Projects > run > debugger settings) however Qml debugging doesn't work until the checkbox is first unchecked and checked again.

Steps to reproduce:

1. Create a new qt quick template project. Select CMake as the build system
2. Attempt to debug QML (=> should fail)
3. Uncheck "Enable QML" and check it again
4. Attempt to debug QML (=> should succeed)