So I've noticed that some tileset mess up the NPC's pathing (movement).
Try moving up Suman Mountain or clear out Orc Encampment with a Summon - it's hopeless.
They get stuck at every corner!
I guess there isn't much to do as far as changing the pathing AI and I suppose the tilesets themselves cannot be fixed.
But prehaps some static placeables could be placed along the edges where they get stuck the most?
Kinda like how we placed spikes around the gatewalls to avoid PC's "jumping" up by mistake.
I think that might solve the issue.
Let me illustrate;
The NPC's get stuck at these kinds of corners:
This is a typical corner where they get stuck and you have to run back, situate yourself in another angle and then tell them to follow you to get them "lose".
I think the way to handle this is to prevent the NPC from reaching that spot where they get stuck, but putting placeables in the way.
This might work to fool the AI to circumvent the place where they get stuck. More suiting placeables might be in order:
Prehaps a job for the beautification team or whatever it was called.
Now obviously there is no need to fix every single corner in these tilesets, but prehaps atleast along the obvious path.