missing change in testing package for kde-gtk-config
https://invent.kde.org/plasma/kde-gtk-config/-/commit/0760b1fd5f16a19475a25084be6e935a9ce7cbb5
A Bug in kde-gtk-config. This is meant to be handled by the gtkconfig.upd kconf_update script in kde-gtk-config, but it currently does not run in fresh installs because it has Version=5 and is thus only handled by kded5.
Will be resolved with this commit: https://invent.kde.org/plasma/kde-gtk-config/-/merge_requests/113
But seems it is not in current version on Archlinux testing https://archlinux.org/packages/extra-testing/x86_64/kde-gtk-config/