For me, it started with my player character casting a scroll of Witch Bolt on the Phase Spider Matriarch. The bolt tethered me to the target, as expected. That's when the "plotting next move" business began. Three spiderlings and the matriarch, effectively all just sitting there. No one blocked anyone's path, in this case (which would be difficult to do with phasing creatures, anyway, right?).
The weird thing is that once this happens in one fight, it apparently carries over to all subsequent encounters, and persists both after reloads and complete restarts of the game. It's like a cheat button you can't turn off. Certainly something that needs to be fixed.
Last edited by Sciophyte; 16/10/20 10:40 PM.