MK3S+MMU2 crash detection stopped working, RESET fixed it
the crash detection on a MK3S+MMU2 stopped working (no crash detected, even if forcing the X carriage to stop manually, crashes lead to layer shifts).
After several trials (toggling ON and OFF Normal/Silent mode and Crash Detection) as last resort I tried a reset (X reset --> immediately pressing the wheel until the menu appears --> reset all)
It fixed the problem!
(just to let you know...)