It was the same when this 1st was added and it still persists today.
The Hunting Iconians part, when you disable power junctions, specially in the area with the last 4, enemies can get stuck on the side of the big round holes and there's no way to attack them, but they can attack you.
Currently, there is no solution to fix this except exit area and re-do the whole zone.
@baddmoonrizin@darkbladejk@wingedhussar#7584 Please move to appropriate section of the Support forums. Also, are you on console or PC, borg0vermind? Since that will also help in putting it in the right section. Thanks.
It's on PC, but I don't think this is related to that. My guess is that various ground support powers make the main enemy drop and then the next wave is spawned there.
Comments
Video:
https://www.youtube.com/watch?v=5uyp9sxtRCk
...THEN THE WINGED HUSSARS ARRIVED!