fungus behemoth on hive sometimes unkillable for melee

Bug Report ID: #1270048341

when fighting the fungus behemoth on hive, i have had multiple instances of him teleporting himself into the back wall fungus patch, and getting stuck on something. he no longer attacks and just tries to walk out of the corner endlessly. as i write this, i am unpaused and undamaged. it is impossible for me to kill him, as the fungal patch will kill me before i can move in, get a couple hits and move back out

i dont think it always happens, i think ive had him port to the middle of the patch and walk out, but more often he ports into a corner and gets stuck. thus i think maybe its the map layout? current layout, cavern entrance is south and cavern is south-south east, with the back wall where he gets stuck being a southern depression in the cavern