Burrowed enemies not activating

Title.

I'm not sure how else to describe the problem. But this week I've been seeing this occur more often. When you come across untargetable burrowed enemies (possibly any enemy that activates with a trigger) they don't activate. Even for enemies that are not visible/fully burrowed you now they're there because you can't walk through them.

I've noticed that some times when you get a good distance away and kill other npcs, looping back will sometimes get them to activate and become targetable, but not always.

Just wrapped up a map with over 50 enemies remaining and they're all the burrowed worms and rock creatures.

Edit: just had another map brick because of this. 2 of the rares, a collapsed skeleton and idk what else cuz it's fully burrowed will not activate.

Interesting thing to note, there are several packs of enemies that were also non-hostile and I was able to stand right in the middle of them. This time I took a few pictures...


Edit 2: Had a friend join my map, and all enemies/rares that were ignoring me activated for him! Map unbricked, but still something is clearly broken.

bump same here with headhunter (for example rocks on hidden grotto)