Created attachment 109399 [details] Screenshot After fixing placement of KScreen on wayland session (https://phabricator.kde.org/D8268) it's broken on multiscreen (3 screens)configuration (see attachment).
Created attachment 109402 [details] qdbus org.kde.KWin /KWin supportInformation
Just like the logout I also did some fixes here. If you are able to reproduce with 5.12 please reopen.