Hello, I am experimenting the same problem. It does not happen in mutter=3.22.1-2.
gnome-session-f reports a segfault while i am logging in so a black screen appears. gnome-session-f [PID] : segfault at 0 ip 00007f3e807b0a29 sp 00007fff0b07b2e0 error 4 in libgtk-3.so.0.2200.4[7f3e804ce000+6f7000]
