In base GTA V, whenever you are near an AI traffic car you can see its occupants. If you get away from the car to the point where you can see the car itself, but not the occupants, and then go close to the car, the occupants change. I guess this is done as an optimization, that way the game doesn't have to keep track of all the different peds and just puts them in the car whenever needed. Is there any mod that makes it so peds inside cars are persistent, i.e. they do not change if you go away?