I went into the lagon fight with a necromancer with just melee minions.
They clearly can reach him, just as the melee skills from player characters. But they constantly get stuck running into place, in random direction. Not even how I would expect if they were just colliding with each other trying to reach the target.
I worked around it, by standing near the edge of the platform at all times, and summoning them a bit a part from each other. But even then, I had to keep re-summoning, because they would still “break” every now and then if they got hit, or lose the target and decided to follow me again.
This just stuck out to me, because it didnt it happened to any other enemies in the game.