Didi you try with a new User added?
One month ago I renamed dot-kde and dot-config Files for my Default User.
It turned out 2 packages were missing.
As an alternative.
When looking at dot-config dir I remembered I Had to add KDE to dot-desktop Files of gnome-keyring-* packages as there was GNOME and XFCE listed only.
Background: Required to start Skype for Linux AS the people in my Environment used it in Corona pandemy.
Not sitting in front of my Linux system - response from Smartphone.
-Sedat-