Hello,
static module linking for QML modules declared using the new CMake API is inconsistent between Linux (Manjaro) and Windows. Here is the overview:

I have a project with the following structure:

Project
 +-- CMakeLists.txt (root)
 +-- main.cpp
 +-- example
    +-- CMakeLists.txt (child)
    +-- main.qml

Root CMakeLists defines a new executable using qt_add_executable. Child CMakeLists defines a QML module with qt_add_qml_module on target QmlModule. The executable is linked to the QmlModule target.

On Linux, this project works as expected - calling QQmlApplicationEngine::load("qrc:/example/main.qml") launches the GUI correctly.

On Windows, the project compiles, but fails at runtime with the following error:
qrc:/example/main.qml: No such file or directory

The official documentation gives an example linking not to the module target, but to the autogenerated plugin (link). This approach works on both platforms.

I don't know which platform displays the correct behavior, but I think it should be consistent.

I have attached a MRE project to test this issue.