[TrinityCore] Polymorph visual not removed when polymorph breaks early

[lunarpac]

Hello again!

Reaper-X Trinity - Revision:1
Compiled By: Jared (Oatman)
TrinityCore Rev: 595
DataBase Rev: TDB 0.0.2
Script Dev Rev: 809
ACID(MOB SCRIPTS) Rev: 0.0.5

As the title states, whenever you cast polymorph in PvE and it breaks early, the visual effect is not removed (a.k.a sheep kicking your ass). I've tried different versions of polymorph (also non-player) and all ranks. It's the same for every rank/spell. I was wondering whether there's a possibility to fix this? And how to do it?

Cheers, Lunarpac.