Yorick Ghouls (Gameplay Bug)

I feel like under an allied tower, a Yorick ghoul that does damage to a champion should immediately become the target of tower aggro, but this was not the case in a game I just played. I found myself (as pantheon) being auto'd by Yoricks ghoul while the tower aggro'd enemy lane creeps that were auto-ing allied creeps, the tower didn't care that Yorick's ghoul was attacking a 20 HP ally champion. If the tower would have shifted aggro to the ghoul instead of the lane creep, I would have survived. I wasn't recording the game, but the tower dealt three shots to enemy lane creeps while my champion was taking damage from the ghoul, which I found most frustrating.

Thanks for considering!