After update to KDE6 my SDDM seems broken. Complains about missing fader.qml module

the current theme cannot be loaded due to the following errors: file:///usr/share/sddm/themes/Shell_Sddm44/Main.qml:114:9:Type WallpaperFader unavailable. file:///usr/share/sddm/themes/Shell_Sddm44/components/WallpaperFader.qml: 28.1:module "org.kde.plasma.private.sessions" is not installed. Did anybody run into this and what module has to be installed, I looked through the sddm and plasma packages but it seems all complete. Also I did not encounter any "qml fader" module in the package search. Suggestions would be highly appreciated. Thank you. Happy Eastern for who likes, seasonal greetings to all the others.