Smart Lock Pro, firmware 5.9.4.
When the knob is turned by hand all the way to the mechanical stop in the open direction, the LED ring stays permanently lit. It stays on for as long as the knob is left in that position - hours, in my case.
An unlock command from the app while in this state reports success but does not move the motor, and the LED stays on.
Turning the knob back just a few degrees switches the LED off immediately.
My door has a lift-up handle and the cylinder cannot pull the latch at all, so there is no spring to return the knob. It simply stays where it was left, which is probably why the LED stays on indefinitely instead of briefly.
For comparison, I have a Smart Lock Ultra on a door where the cylinder does pull the latch. Turning that knob to the stop lights the LED too, but the latch spring pushes the knob back a few degrees on release and the LED goes out by itself. So the difference seems to be purely whether something returns the knob, not the lock model.
I do not recall seeing this on 5.7.x, only since updating.
Should the LED stay lit indefinitely in that position, or should it time out?