Digsite and Abyssal, Can't loot inside boss room

I'm not sure if this was reported before. But there's an annoying problem if the abyssal monsters spawn inside the boss arena on digsite. It's really annoying not being able to loot the coffers after such a juiced map. This happened after the boss dropped those pillars in the arena.
https://imgur.com/a/4fZRGtX