Pedestrians disappear when our character moves to another popcycle zone.

[Fifteensencher]

Another unpleasant feature of the game is that when our character moves to another popcycle zone with other pedestrians in the group, the pedestrians from the previous zone disappear if you turn the camera away from them, even if they are a couple of meters away from us. Sometimes they may not disappear.

[r3538987]

Maybe I'm wrong, but this seems to be a thing for many R* games.
Where peds behind camera may be disappear even in close proximity.
Never was able to figure it out why this may happen, and your message could be reason for it.