Created attachment 164559 [details]
System settings

SUMMARY
After updating to KDE Plasma 6.0 Beta 2, the System Settings app doesn't work anymore, with the following error message:
```
Error loading QML file.

qrc:/kcm/kcm_landingpage/main.qml:18 Type KCM.SimpleKCM unavailable
qrc:/qt/qml/org/kde/kcmutils/SimpleKCM.qml:33 Type Kirigami.ScrollablePage unavailable
file:///usr/lib/qt6/qml/org/kde/kirigami/ScrollablePage.qml:68 Type Kirigami.Page unavailable
file:///usr/lib/qt6/qml/org/kde/kirigami/Page.qml:237 Type Kirigami.PageRow unavailable
file:///usr/lib/qt6/qml/org/kde/kirigami/PageRow.qml:180 Type OverlayDrawer unavailable
file:///usr/lib/qt6/qml/org/kde/kirigami/OverlayDrawer.qml:22 Type KT.OverlayDrawer unavailable
file:///usr/lib/qt6/qml/org/kde/kirigami/templates/OverlayDrawer.qml:120 Cannot assign object of type "KTP.IconPropertiesGroup" to property of type "IconPropertiesGroup_QMLTYPE_89*" as the former is neither the same as the latter nor a sub-class of it.
```

STEPS TO REPRODUCE
Could not reproduce it on a brand-new system, but it happened on mine.

OBSERVED RESULT
The above error message, screenshot attached. This error message appears on every tab.

EXPECTED RESULT
Systems settings would work.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: EndeavourOS with up-to-date system and kernel
(available in About System)
KDE Plasma Version: 5.91.0
KDE Frameworks Version: 5.91.0
Qt Version: 6.6.1

ADDITIONAL INFORMATION
N/A