Impossible to reach abbysal coffer spawn on Digsite map

On map Digsite its possible for abbys to spawn inside boos room. After boss casts his spell will falling pillars sides of arena become impassible terrain, but abbys coffers can spawn there resulting in impossible to reach coffers.

Screenshot with example https://imgur.com/a/h1sZJGW
Even when standing next to coffer it cannot be opened