Mob AI....Inconsistent
Summed up…. Mob AI behavior ranks, on a scale of 1 to 10, as “Potato”. Theres actually some rather interesting AI behavior that never gets quantified, because most mobs are stupidly aggressive by default. Did you know mobs are attracted to Toughness? I didn’t until I saw it on the forums. Did you know some hostile mobs are supposed to be afraid of you? Did you know them running is triggering the “Fear condition” behavior without the actual condition? Did you know thats why bats and moas run, only turn around and attack you again after a few seconds?
The path finding issue however is new. Whatever changes they made for the Revenant cascading AOE had some kind of side effect on ALL path finding behavior in the game. If its not a Projectile (which is a free traveling object in 3D space), then something as small as uneven terrain can cause path resolution to fail. You can see this a lot with Ground hugging attacks, and especially with Blink skills.