Unending Breach due to rare on pallets.

In a factory map that is a Kirac mission of start the Delirium. Delirium ended shortly after breach stabilized. I killed the first two rares, but the third rare is just standing there, menacingly, atop pallets, which I assume make it out of bounds. It does not seem to act and also takes no damage. I stood around and killed breach monsters until my Rampage combo hit 1000 (apparently the cap) but it the rare atop the pallets has not budged nor has it's life bar. I am dealing Phys+chaos+fire+ice+lightning with my main attack (80k dps at least) and have a graft that deals lightning damage (23k-208k with its 13 bolts) in a level 72 map hence since the rare standing atop the pallets nor its healthbar is moving, I am assuming it is a bug.
I even tried dying and returning to the map and it did not close the breach.

Bug reference number is 2,944,151,721.