[BUG:]; Compositor broken for rpi4 in last patch

[Lander1979]

since the last update on 26/12/20 my rPi4 4gig fails to Boot correctly. SDDM starts with Black Screen and Cursor only. I no longer have access to my GUI login. I can still open other tty's so I will disable SDDM and look for an alternative login manager for now.

Disabling SDDM and starting xfce4 I find I have a cursor and launch menu but no desktop environment. Something is horribly broken, I suspect video driver issues. Looking into it further.

Compositing was switched on inside XFCE and looks to be broken in the latest patch. The Windows Manager Tweaks applet refused to function, But going into the settings editor did work and removing the bool/checkbox for compositing has restored my XFCE Desktop environment as well as the SDDM login manager.