Mob Stuck in floor in Vaal Factory

I've ran into this issue multiple times in Vaal Factory specifically.

There is a mob type (a walking spider with bows for arms) that constantly will get stuck under/in the map. I've tried everything I can think of to get them out of the map and nothing works. I've also tried various abilities to try and hit it to no avail. Unfortunately it is almost always one of the rare mobs required to complete the map so I have to fail the map and then redo it and hope none of the rare mobs are that mob type. Bug report ref# 3,011,261,062.



https://imgur.com/a/BIxU5JA