Hi, I experience the same problem. I temporarily fixed it by uncommenting "WaylandEnable=false" in /etc/gdm3/daemon.conf. This prevents the problematic xwayland from even loading up. It hasn't crashed since. Neither have I experienced side effects from using gdm in this "legacy" xserver only mode.
So until there is a proper fix this might be more convenient than downgrading the package and putting it on hold. Dave
