ReflectionProbe properties cannot be assigned in QML

Trying to compile Outrun_Cluster project with Qt 6.5.3 on macOS , I get this:

qrc:/qt/qml/Main/main.qml:7:1: Type App unavailable
qrc:/qt/qml/content/App.qml:48:5: Type Screen01 unavailable
qrc:/qt/qml/content/Screen01.ui.qml:3270:5: Type MyIntro_particles unavailable
qrc:/qt/qml/content/MyIntro_particles.ui.qml:266:17: Cannot assign to non-existent property "boxSize"

Funny thing is that with Qt DS (4.3.2) the project runs nicely on top of Qt 6.5 env.