TileEntity

Add crash-reports with sites like https://mclo.gs/ Make a test without the mod Zeta

Create a new instance and start with these mods - try different builds until you find a working combination Then add the rest of your mods one by one or in groups

Make a test without Optifine

Also make a test without modernfix and fastload

projectile_damage is a client-side-only mod Remove it from your server, keep it in your client

There is a client-side-only mod in your server's mods folder The mod is not mentioned Add a screenshot of your server's mods folder

Still an issue with client side mods Maybe dotf-0.0.5-B-1.20.1.jar

Add then full log with sites like https://mclo.gs/ and paste the link to it here

Also make a test without NoChatReports

Cracked Launchers are not supported

In the server.properties, set max-tick-time to -1

Maybe an issue with friendsandfoes

Same issue without lootbeams?

Add the latest.log from the logs-folder

Same issue with the older build? https://www.curseforge.com/minecraft/mc-mods/simple-storage-network/files/3863227

Make a test without carryon

Add the new crash-report

And without modernfix?

There is an issue with The Aether - maybe a conflict/incompatibility with Nostalgic Tweaks

Make a test without the mod lucent

There is an issue with progressivebosses or its dependency insanelib - try other builds of these mods

Make a test with Embeddium instead of Rubidium

Remove the mod Zeta

There is a conflict between dynamictrees, dynamictreesBOP and BOP Make a test without DynamicTreesBOP

Try different builds of these mods until you find a working combination - then add the rest of your mods