What happened?

I've started a new server with the modpack names medievalcraft and when I try to join the server it says the recipient has an id not recognized
"Registry remapping failed: Received ID map for Minecraft:item contains IDs unknown to the receiver! - better nether:spawn_egg_naga"

BetterNether

7.1.2

BCLib

2.1.5

Fabric API

No response

Fabric Loader

No response

Minecraft

1.19.2

Relevant log output

No response

Other Mods

https://www.curseforge.com/minecraft/mc-mods/franciscofunari

This usually means, that the mod-versions / -configs on client and server are not in sync.

I've used the same packs and everything so I'm assuming maybe some config stuff
Do you have an idea to fix it?

Did you change the default configs? That is known to cause problems.

We've the same problem with 7.1.3, maybe related to this: FabricMC/fabric#2168

I'm not that deep in fabric, as I understand it, they've change something with the registry sync between client and server.

Thanks for that link, but our Mods have to be present on Server and Client to work properly. As far as I can tell, the issue linked issue is about Server-Only Mods.

But, if you have another server-only mod installed that may be trigger the problem