If two players have a filled map item of the same map ID, it will not show either player's markers on the map if the map has a custom color or display.
I also noticed if there is a map with a custom display tag in an item frame, it causes the player to blink in and out of existence on the map.
Note the player is red on the map marker in the image below due to a resocepack, when turning this off, the bug still happens I just forgot to when taking the screenshot.
I should probably add that I'm using Minecraft realms when this happens, I have not tested it on a vanilla server.
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I used the command
/item replace entity @s weapon.offhand with filled_map{map:0,tag:{display:{MapColor:16711680}}} 1
This is the same issue as MC-266990, only instead of adding a 'display:{Name:'"[name]"'}', you are adding 'display:{MapColor:16711680}'
I would suggest a mod forward resolve this as a duplicate, and update MC-266990 to include the fact that this behavior is not exclusive to the 'Name' data, but generally adding additional information to the 'display' tag
"if the map has custom color or display"
Please provide the command you used. Also, please attach images or a video showcasing this bug.