I too have experienced this. (tempAFK and not playing, and everything paused/stopped)
I wonder if this is potentially GM intervention, maybe like a soft hand of "i see you but you havent been a dick yet" kind of thing. (i actively avoid being on folks radars and do my best to be on the best behavior whenever I incidentally interact with someone.)
However at the same time, I can have toons sitting in PoK for days running overseer with no forced logouts, and sometimes ill come back from bathroom and be at char select.
No pattern found yet.