I see what you are saying however the fact that the cockroaches in the area also do not die when stomped on just once, tells me they are just ignoring this area like it isn’t costing them anything. The cockroaches also seem like they would be an easy fix. A bunch of them have to be stomped on in a certain amount of time for an achievement. Seems that achievement has been broken since prepatch to shadowlands as well as the filthling drop. 2 easy ones they could have just fixed right away.