so the AI saw you from across the map, damn, that can happen, so there is a small problem that the game is Frame based, so for lover fps (10) the AI dosent detect you at all but for high i guess it's instant detection (VSync is on), i had my fps at 75, i could move detection to be on FixedUpdates (only way to turn off vsync if you play on Low).
Also you get this flashing Post Processing when you are getting detected so that's an indicator, the distance fall off is Linear but i somehow should make that to be a Lerp, that should be way better.