So, I don't know about the vertical axis affecting it, but our Ranger did experience issues with targeting the mob when it was aggro'd to the pet.

I'm surprised, it was consistently working like this our entire play time; about an hour. We just dealt with it.
This is in DF between the Rocots and Cambions, hib side. The pet was placed at the opening separating the two groups of mobs.
We can try to reproduce it as well.

I am also experiencing the same behavior with Verdant PBAOE and have figured out that it is because the main pet does not have aggro. Here is the first scenario: Ranger pulls mob, 2 inc. Ranger stands just behind main shroom pet for perfect PBAOE proximity. Animist times Briar Storm pbaoe to land wh...