Mod List:
Map Atlases 1.21-6.1.3 (map_atlases)
Minecraft 1.21.1 (minecraft)
Moonlight Lib 1.21-2.17.34 (moonlight)
NeoForge 21.1.133 (neoforge)
When I place pins on the map, they disappear after I leave and rejoin the world. However, banners remain as expected.
Steps to reproduce:
1.Place a pin on the map.
2.Leave the world.
3.Rejoin the world.
4.The pin is gone, but banners remain.
Hope this helps. Thanks!

Mind hd king if it works on fabric or 1.20?

It works on Forge 1.20.1, but it doesn't work on Fabric 1.21.1