When I was doing the kills for My Little Chocobo, I noticed a possible issue with vertical mob agro tethers at Central Shroud ( 17.1 , 20.2 ) Z: 0.9
Attacking a brood ziz on the upper section would cause agro with some qirin in the cave far below. Another player mentioned having a similar event happen nearby when attacking a slug and one of the flying dragon type mobs above came down after them.
I checked the same circumstances in a normal realm, and everything worked normally there.

Playing in midwest United States, so game response has been fine otherwise so far.