Shoggoth Tenement

One time, when I went exploring after triggering it (button), he got stuck under the ceiling and didn't come down until I died and respawned.
Plus steering it affects brightness and hints toggle.

Upper floating guy got stuck under a ledge when I died in the depth (left of the checkpoint when entering the area). Couldn't kill him or reach him otherwise. Had to reset by leaving and re-entering the tenement.