During the Coop mission, Headhunters, the AI was able to spot me, in a pitch black environment (around 3:00 AM). Yes they had nightvision, but being able to hit me with a scope that does not have IRNV, and over ~200m is outrageous. I was hiding nowhere near a light source (I was stationary and prone under a tree), and yet they spotted me. This was on Regular difficulty, mind you.
I could not shoot them because I couldn't see them with my optics, yet they could. I thought this was a bit much. There was no way I could hit them with the red dot sight over 200m; how could they hit me, let alone spot me?
I also noticed the AI could spot me while swimming in the Scuba Showcase mission as well, either peeking out of the water or trying to sneak on shore (But I was in a wetsuit, so I probably stuck out a bit, lol).