Is anyone else having an issue with their water elemental breaking polymorph? If I have my elemental on defensive and cast polymorph on a target the elemental immediately targets my sheep (pig/monkey/turtle) and breaks it. I end up putting my elemental on passive for any pull that requires CC, but sometimes I forget to tell it to attack. It would be much easier if the elemental would not attack my polymorphed target (unless I later cast an offensive spell towards it).
Is this a known bug or expected behavior?