Could you please advise if the following is a bug or working as intended?

In The End, I created a level 4 zoomed map, copied it for my wife, and we each are exploring the area. When we move further apart, our purple player arrows is no longer visible to the other player. Our own player arrow of course is visible to ourself. I've never noticed this happen in the overworld. Is this working as intended? I did confirm that these are maps created from Empty Locator Map and not just Empty Map. Maps that we place into item frames within The End display correctly and do not vanish when traveling away from them.