I'm guessing you are looting the proper boss to get the stick? I know this is probably a given that you are, but starting with the simple things.
I killed the creature twice, once as a gm and once as a player and the stick was there both times.
A player did mention to me that they had been in the area on a couple of occasions lately for aloe and killed the creature that drops the stick, leaving the stick on the corpse.
I don't know if this could cause it to not drop or not, but just some observations.