If there's a kernel stack trace mentioning "drm_atomic_nonblocking_commit" around the same time then please also paste that here. It's not yet clear if this is mutter or the kernel's fault.
Likely workaround: Add to /etc/environment
MUTTER_DEBUG_FORCE_KMS_MODE=simple
and then reboot.
If there's a kernel stack trace mentioning "drm_atomic_ nonblocking_ commit" around the same time then please also paste that here. It's not yet clear if this is mutter or the kernel's fault.
Likely workaround: Add to /etc/environment
MUTTER_ DEBUG_FORCE_ KMS_MODE= simple
and then reboot.