Game Mechanics: Neriak Foreign Quarter Pathing

[Morsakin]

I've noticed that quite a few of the level 50 ogres / trolls in Neriak Foreign Quarter are warping through the ground/walls/ceiling if you attempt to solo them. I remember this being an off-the-beaten-path leveling spot back in the day, but the pathing here makes it nearly impossible.

When you would fear them back on live, their default fear path would take them through the small, cramped tunnel towards the back, whereas now they decide they want to randomly walk on top of the buildings and so forth. If they do enter the tunnel, they begin falling through the world, eventually warping right on top of you/near you, preventing any LOS while they're doing so.

Any help / clarification would be appreciated.