Created attachment 179480 [details]
Various dropdowns in the Window Rules dialog light up (sometimes all-at-once) but are empty

SUMMARY
After recent updates (not sure when this started... KWin rebuild for Qt 6.9 was the 11th and my kwindowsystem upgrade was yesterday), the dropdowns for the Window Rules dialog (special window settings). Same thing in the relevant syssettings panel, but not in e.g. the mouse settings panel.

STEPS TO REPRODUCE
1. Special Window Settings
2. Click dropdown

OBSERVED RESULT
Uncannily empty slots. Selecting them does change the value of the dropdown but not that of the sltos.

EXPECTED RESULT
I see the values of the slots

SOFTWARE/OS VERSIONS
kwindowsystem Version: 6.12.0

Operating System: EndeavourOS 
KDE Plasma Version: 6.3.3
KDE Frameworks Version: 6.12.0
Qt Version: 6.9.0
Kernel Version: 6.13.7-zen1-1.1-zen (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 2700X Eight-Core Processor
Memory: 31.2 GiB of RAM
Graphics Processor: AMD Radeon RX 580 Series

ADDITIONAL INFORMATION
This is not the first time a 6.9 has broken my life. I'm talking bug 500968 ofc.