TileEntity

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

Add the new crash-report or latest.log (logs-folder) with sites like https://mclo.gs/ and paste the link to it here

Delete the curios-server.toml file in your config folder If there is no such file, check the worldsave / serverconfig folder

Replace letsdo-API with this build: https://legacy.curseforge.com/minecraft/mc-mods/do-api/files/5468182

Add the crash-report or latest.log (logs-folder) with sites like https://mclo.gs/ and paste the link to it here

The supermartijn6 builds and rechiseled builds are not matching - try other builds of the supermartijn mods or remove rechiseled

Also check the worldsave / serverconfig folder If there is no such file, make a test without this mod

Delete the config of RandomTweaker (config folder) If there is no change, remove this mod

Add crash-reports with sites like https://mclo.gs/ Make a test without CustomCursor and/or jeg (justenoughguns)

I have no idea - looks like the log just stops

An Ostimien mob from it is invalid at pos 170,66,-143 Check the config (lycanitesmobs-spawning.cfg) and temporarily disable Ostimien

Backup the world and make a test without alexscaves