Hi, Since the recent removal of QT_QPA_PLATFORM=wayland, we lost some functionality. At the moment it seems that kded is being ran as xcb so the per-screen scaling isn't being set up. Also system settings shows the behavior for xcb instead of the one for wayland also with the per-display UX broken.
I also see that Spectacle is now even more broken as it's trying to ask xcb for the screenshots. Aleix