At the moment I'm including all QML components in the main app module and that works fine. But when I try to move some of them into separate modules (and add the import statement in main.qml of course), I get the runtime error "MyImportedComponent is not a type".

NB: In Qt Creator, in main.qml, the import statement is parsed fine and MyImportedComponent shows up correctly colour-coded (not M300 error).

Here's what I tried...

All in the app module works fine:

qt_add_qml_module(appMyProject URI MyProject VERSION 1.0
  QML_FILES
    main.qml
    MyImportedComponent.qml
)
target_link_libraries(appMyProject PRIVATE Qt6::Quick)

Separate module doesn't:

qt_add_qml_module(SeparateModule URI SeparateModule VERSION 1.0
  OUTPUT_DIRECTORY SeparateModule
  QML_FILES
    MyImportedComponent.qml
)
qt_add_qml_module(appMyProject URI MyProject VERSION 1.0
  QML_FILES
    main.qml
)
target_link_libraries(appMyProject PRIVATE Qt6::Quick SeparateModule)