Humon'gozz doesnt spawn from mushroom

[ryuhyo]

WoW Freakz link: https://www.wowhead.com/npc=164112/humongozz
Character name: Hallowsoul
Bug description: the rare Humon'gozz doesnt spawn from the Rapidly Growing Mushroom. after some time when you use the unusually large mushroom on the damp loam, it should spawn a mushroom and itll grow into the boss. as you can see in this vid https://youtube.com/watch?v=VciowGG1cZM:


Proof: https://i.imgur.com/gTWiWp5.png