I’m not sure if this is location based, I have encountered it in various places and didn’t make notes of them. If it is location based, then it will take a very long time to get rid of them all.
it hink the solution is simple: the cause must be investigated why can enemies go into terrain at all? or it is an issue like overlapping terrain pieces have 1 pixel wide holes , so it allows blightstormers cast through solid-like walls? if so, how on earth can a rat get into a 1 pixel wide hole? something is terribly wrong in both situations.