It is especially bad on harbinger, sometimes they’ll get stuck in this mode where they refuse to attack the sliime on akarat about 2/3rds through the fight and it really drags things out. It’s not deterministic though: sometimes they will attack it. i’m also Using aspect of the alpha if that helps.
Another interesting thing is if I try targeting the portals they’re distracted by, they still won’t do it. They’ll follow me if I try walking away, but still won’t attack it.