boss stuck in wall, unable to kill it, trapped in map

on the phaaryl megalith unique map, devourer boss left behind one of its tail loops right in the middle of the arena. most other bosses spawned to the side of it so it wasn't a problem, but 2 of them spawned inside it. first the crow, which i was still able to damage (though it was stuck in place and couldn't attack back); then the incarnation of death, which i cant damage with any of the abilities i have. i also can't leave the map to try other abilities cause portals are disabled in bossfights...

screenshots:



there are patches of burning ground so i could kill myself if necessary, but would like to avoid that since it wastes xp and i would need to die multiple times to leave the map

opened the game after a few hours and was back in the hideout, not sure whether the instance simply timed out or an admin got me out; regardless, problem solved. figured i would just retry the map. waste of a waystone but that's not a big deal.
but when i open the atlas, the map is red and says "map failed". first time it has happened to me but it seems like intentional design for unique maps to be single use?


except i didn't fail the map. i lost it to a stupid bug. and now i have to find another somewhere else on the atlas. due to no fault of my own. very annoying.