When I teleport two players to a location that is ca. 200 block far away (render distance: 12), they get invisible. Tested it in a lan world flat map at coordinate 0, 0 and teleported @a to 0, 250. But if I tp them separately they didn't get invisible.
I've uploaded a video that show, how the bug occurs to me.
https://youtu.be/RL6pmNHjPfo