Ancient Petrified Leaf Quest chain

Hello every hunter on the server :)
I recently picked up "Ancient Petrified Leaf" from Molten Core, and started the quest. I have gotten to the part where i need to kill 4 demons and get their heads. I have 3/4 heads now, but the demon in Slithus isnt dropping his head. (i have killed him 6-7 times now).
Does anyone know if the quest is bugged or am i doing something wrong? Thanks for responses

Sincerely FlingFling The Explorer

It's on bug tracker:
https://www.warmane.com/bugtracker/report/10102

Thank you so much!
But too be clear then, there is now way as off now to finish the quest legit?

If there is a workaround, it's usually posted in comments on bug tracker. For this quest I don't see anything like that.