I just got the unit so I dont know if the bug existed in previous versions but if you link to a motion sensor 2420M and go to the settings, the checkbox for On Only Mode is incorrect. The manual is correct in that checked means only ON commands but the checkbox says checked is ON/OFF. Since it is ON only mode it is logical that checked would be ON ONLY. So I think its just a matter of reversing the text there.
Will keep testing 2.8.12.
MacJeff