I'm pretty sure its just normal autoset triggering on NPCs now. Before (and probably still), if you were talking to an NPC autoset would count you as zoning (i may have this wrong, been a while since i've looked at it). And now when you come out of the dialogue it just switches you back to Idle and your autoset idle command kicks in.
If it matters, it happens to me too.
turn gearswaps on or debug and check those logs. Also, while you're talking to an NPC type /echo %status and see if it says zoning (or something besides idle)
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