Game Mechanics: Dragon Necropolis: an empty nest (trap) is somehow aggroable

[Zinyen]

I was in a party in Dragon Necropolis, and I had a charmed pet.

We pulled beetles up and somehow my pet aggroed on "an empty nest". It was untargettable. I tried to have no target and get hit- it was still untargetable.

I was using AOE mez on the beetles, but I've done that a number of times and never aggroed a trap.

I think it was an interaction between my charmed pet and the nest that caused the bug. If/when I get more info I'll add it here but I wanted to post it up with what I had now.