I added logging to the Bot:
epop() It doesn't trigger when the bots are vanishing.
Bots basically only fudge up, when a party member zones into the zone, (Does not call Bot:
epop() yet bots vanish) or if the main toon zones in after other players. Bots go non-responsive, basically drop group, but not visually updated on client side.
So, what ever re-groups the players, when zoning, with bots is what is broken.