This can be totally game ruining on Athel Yenlui and god knows where else, especially if it pops up just as you drop down after the giant forest with the two tomes & grimoire in that small area before the cave. Bosses typically bring hordes and this issue ruined a Legend game.
I’ve also seen pictures showing that the bosses sometimes either don’t aggro or just bug out and the walls remain. What gives? And why do these exist?