Isn’t Narcissus a PVP addon? If so then it might have provided the chatframe deselecting for “PvP Expediency”.
I guess the same might go for anything to do with instanced combat also. But generally any addon that hasn’t been updated since the problem started is a possability.
AFAIK, it’s just an alternate dressing room and selfie composer. (Although it did have some convenience features for Remix characters, like quick access to adjusting tinkers.)