Created attachment 170809 [details]
Reproduction screencast.

STEPS TO REPRODUCE

1.  Updated OS using `plasma-discover`.
2.  `systemctl reboot`.
3.  `systemsettings`.
4.  Select any of the KCMs depicted at https://www.mediafire.com/file/2pvn6adh2tgh0te/Screencast_20240622_115500.webm/file - the "Colour & Theme" ones are all broken.

OBSERVED RESULT

> **Error loading QML file.**
> 
> ```log
> qrc:/kcm/kcm_sddm/main.qml:38 Type NewStuff.Action unavailable
> qrc:/qt/qml/org/kde/newstuff/Action.qml:167 Type NewStuff.Page unavailable
> qrc:/qt/qml/org/kde/newstuff/Page.qml:133 Type Kirigami.InlineMessage unavailable
> file:///usr/lib64/qt6/qml/org/kde/kirigami/InlineMessage.qml:63 Type KT.InlineMessage unavailable
> qrc:/qt/qml/org/kde/kirigami/templates/InlineMessage.qml:123 Cannot assign object of type "TP.IconPropertiesGroup" to property of type "IconPropertiesGroup_QMLTYPE_81*" as the former is neither the same as the latter nor a sub-class of it.
> ```

EXPECTED RESULT

All KCMs listed should be visible via `systemsettings`.

SOFTWARE/OS VERSIONS

Operating System: Fedora Linux 40
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
Kernel Version: 6.9.5-200.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 7600X 6-Core Processor
Memory: 30.5 GiB of RAM
Graphics Processor: AMD Radeon RX 5700
Manufacturer: ASRock
Product Name: X670E Taichi