I recommend setting timeacc to around 0.1 to observe this mission.
Repro:
1. Step out from behind the concrete barrier. Walk, so as not to give away your position audibly. (This close range best displays the FOV glitch)
2. Fire a single round into the concrete barrier.
3. Wait several seconds for the AI to become alarmed. KnowsAbout will increase, red circles of perceived position will appear on the runway around the player. Note the high degree of inaccuracy of the AI's position guess.
4. When the AI has begun to swivel, KnowsAbout will suddenly increase to 4. Red and white smoke will burst from the player. This indicates that he has been spotted. At this point observe that the AI should only be able to see the player's position through peripheral vision, at best. He may even be looking through his own helmet.