Okay tested on plasma with kwin
1st try which failed as already talked in IRC was probably due some patch testing on my side which screwed everything other it seems, I had to chroot in to roll back. I saw as well some virtualbox error inside usysconf which surprised me because I didn't use it
2nd try: Updated --> usysconf errors as expected --> hard shutdown and then booted without issues
3rd try: Dump user, Updated and rebooted via menu --> I was hanging on my Desktop around and didn't get shut down --> had to hard shutdown and booted wiithout any issues