After i was facing many problem’s around Wayland related to my Nvidia 2080Ti and Nvidia X Server Settings which is no longer possible to use under Wayland since the options are blocked.
So i have reinstalled plasma-x11-session to keep using X11, but now i have a problem that Transparence and blur effects are broken.
Wayland transparence/blur:
X11 with KDE 6.5.3, ugly transparence/blur:
Looks like this is a known bug and was fixed on Wayland but the X11 version was not fixed at the same time and the fix for it landed only 3 weeks ago, mere days after 6.5.3 was released. Should be resolved in 6.5.4, as it is mentioned in the patch notes.
Thank you for that detailed info, i will mark your info as solution, as soon i have 6.5.4 and see that this problem is solved 
Edit: Problem solved with KDE 6.5.4
