[1.20.1]Villagers added by other mods are not displayed on the server

[lingmu0]

Villagers added by other mods are not displayed on the server, but it is normal in single player games.
I installed it on the server, but this bug still exists

[moechakucha]

this mod does not implement any mechanism on server side
but yea this is indeed an issue, i'll check it out later

[abrossimow]

It's interesting that it works in Singleplayer normally but reverts back to vanilla trades during a multiplayer game with a server running the same data/mods. Why is that?