Musescore 4.4 doesn't run on OpenSUSE leap 15.5 or 6

Hello!
I got musescore from https://download.opensuse.org/repositories/multimedia:/apps/15.[56]/x86… but it doesn't work - mostly because of incompatibility of QT5 / QT6. The system itself runs Plasma 5 (QT5), but the necessary QT 6 libraries are installed - at least those, which are automatically requested based on dependencies.

If I start mscoe, it ends with the following error:

18:01:00.213 | INFO | main_thread | GuiApp::perform | Using graphics api: "opengl"
18:01:00.213 | INFO | main_thread | GuiApp::perform | Detecting problems with graphics api
18:01:00.848 | WARN | main_thread | Qt | QQmlApplicationEngine failed to load component
18:01:00.848 | ERROR | main_thread | GuiApp::perform | error: qrc:/qml/platform/linux/Main.qml:57:5: Type WindowContent unavailable
18:01:00.849 | ERROR | main_thread | GuiApp::perform | error: qrc:/qml/WindowContent.qml:97:9: Type NotationPage unavailable
18:01:00.849 | ERROR | main_thread | GuiApp::perform | error: qrc:/qml/NotationPage/NotationPage.qml:246:13: Type InstrumentsPanel unavailable
18:01:00.849 | ERROR | main_thread | GuiApp::perform | error: qrc:/qml/MuseScore/InstrumentsScene/InstrumentsPanel.qml:234:25: Cannot override FINAL property
18:01:00.849 | WARN | main_thread | Qt | qrc:/qml/platform/linux/Main.qml:57:5: Type WindowContent unavailable
18:01:00.849 | WARN | main_thread | Qt | qrc:/qml/WindowContent.qml:97:9: Type NotationPage unavailable
18:01:00.849 | WARN | main_thread | Qt | qrc:/qml/NotationPage/NotationPage.qml:246:13: Type InstrumentsPanel unavailable
18:01:00.849 | WARN | main_thread | Qt | qrc:/qml/MuseScore/InstrumentsScene/InstrumentsPanel.qml:234:25: Cannot override FINAL property
18:01:00.851 | ERROR | main_thread | GuiApp::perform | failed Qml load

The above error is based on the export
QT_QUICK_CONTROLS_STYLE=Material or Basic

Without the export, mscore complains about missing org.kde.desktop:

19:07:13.767 | WARN | main_thread | Qt | QQmlApplicationEngine failed to load component
19:07:13.767 | ERROR | main_thread | GuiApp::perform | error: qrc:/qml/platform/linux/Main.qml:29:1: Type AppWindow unavailable
19:07:13.767 | ERROR | main_thread | GuiApp::perform | error: qrc:/qml/AppWindow.qml: module "org.kde.desktop" is not installed
19:07:13.767 | WARN | main_thread | Qt | qrc:/qml/platform/linux/Main.qml:29:1: Type AppWindow unavailable
19:07:13.767 | WARN | main_thread | Qt | qrc:/qml/AppWindow.qml: module "org.kde.desktop" is not installed
19:07:13.770 | ERROR | main_thread | GuiApp::perform | failed Qml load

Does anybody has any idea to get it working?

BTW: Musescore 4.3.2 works w/o any problem (compiled by my self based on the tumbleweed source package on leap 15.6)!

Thanks!