Postscript
This issue has been resolved.
This is a Spigot server issue and works fine on vanilla servers.

I can't speak English.

In single player you can see the item frame in the distance, but in multiplayer you can't see the item frame.
If you use a command to fit the map remotely, the map will not be updated only in multiplayer.

Copy what the player has in his hand to the item frame.
/item replace entity @e[type=item_frame] container.0 from entity @p weapon.mainhand

Loading with the /forceload command has no effect.

Reason for reporting.
I made a command to stand of pin the map, but it doesn't work only in multiplayer.
I want the item frame and map to work in multiplayer over long distances.

postscript
If it's a multiplayer server
Even one person has a problem.