I can confirm the behavior as reported by BertN45:
Setting MUTTER_DEBUG_ENABLE_ATOMIC_KMS=0 and MUTTER_DEBUG_FORCE_KMS_MODE=simple in /etc/environment does not help, but disabling Wayland in /etc/gdm3/custom.conf does help.
I also tried both Ctrl-Alt-F1 and chvt 1 when the screen is frozen, neither changed anything.
I can confirm the behavior as reported by BertN45: DEBUG_ENABLE_ ATOMIC_ KMS=0 and MUTTER_ DEBUG_FORCE_ KMS_MODE= simple in /etc/environment does not help, but disabling Wayland in /etc/gdm3/ custom. conf does help.
Setting MUTTER_
I also tried both Ctrl-Alt-F1 and chvt 1 when the screen is frozen, neither changed anything.