TileEntity

the_vault is conflicting with apotheosis

Maybe an issue with Quark or Canary

Try different/older builds of Iceandfire and Citadel

It is possible to delete these registries/entries from the level.dat via NBT Editor https://github.com/jaquadro/NBTExplorer

Server build? Version?

Update your AMD/ATI drivers - get the drivers from their website - do not update via system

Repeat it for the pamhc2trees.toml file Check the first lines for other mentioned toml files if it is crashing again

Maybe a rendering issue with SodiumExtras

Do you use this build? https://www.curseforge.com/minecraft/mc-mods/neoelfeos-medieval-pub-decoration/files/3296198

Update your AMD/ATI drivers - get the drivers from their website - do not update via system

Add crash-reports with sites like https://mclo.gs/ Make a test without the xaero mods If there is no change, add the latest.log from /logs/

Delete the curios-server.toml file in your config folder

Add client and server log after such a disconnect

If it is no lagging ingame, you can ignore this message

And without LMFT?

And does it have a server pack?

There are issues with christmasfestivity, paladin-furniture-mod and excessive_building

I have no idea Does a pre-configured modpack work? Most of these already have a server pack

Looks like an issue outside of Minecraft - some kind of Network issue

Add the full log

And without necronomicon?

Remove lithium or modernfix

Also remove sodiumdynamiclights from the server

Rechiseled is not working - there is an issue with the supermartijn mods Maybe you will need older builds of these There are several 1.12.2 builds: https://www.curseforge.com/minecraft/mc-mods/supermartijn642s-config-lib/files/all?page=1&pageSize=20&version=1.12.2&gameVersionTypeId=1 and https://www.curseforge.com/minecraft/mc-mods/supermartijn642s-core-lib/files/all?page=1&pageSize=20&version=1.12.2&gameVersionTypeId=1

Add crash-reports with sites like https://mclo.gs/ Start with removing veinmining