When selecting the already selected look and feel package in System Settings the dialog says "This Global Theme does not provide any applicable settings. Please contact the maintainer of this Global Theme as it might be broken."
This only happens when the kcm has just been opened. If instead you select another theme and cancel that dialog, then you don't get the error message.
Notice that this is only a wrong message, as the applying part actually works.

STEPS TO REPRODUCE
1. `systemsettings kcm_lookandfeel`
2. Click on the already highlighted theme

OBSERVED RESULT
"This Global Theme does not provide any applicable settings. Please contact the maintainer of this Global Theme as it might be broken."

EXPECTED RESULT
Two checkboxes with "Appearance settings" and "Desktop and window layout"

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Fedora Rawhide KDE
(available in About System)
KDE Plasma Version: 5.92.0
KDE Frameworks Version: 5.248.0
Qt Version: 6.6.1

ADDITIONAL INFORMATION