The power button of my FP3 is unresponsive in an odd way.
Power off: The power button works as expected and the phone boots
Power on: The power button does not respond at any time to short press, long press or ant combinations like for a screenshot. The only way to turn the phone off is to take out the battery and put it back in.
(At which point, the power button works as expected to boot up the phone only)
So, it seems to me that it still “works”. Just, not entirely.