I have confirmed that ...

• Arclight is up to date
• all dependencies are installed
• all plugins and mods are up to date
• unable to reproduce in Spigot
• unable to reproduce in Forge

Arclight version

Version 顿顽 (Trials) / arclight-1.20.1-1.0.5-1a8925b

OS & Java versions

openjdk version "1.8.0_422" OpenJDK Runtime Environment (build 1.8.0_422-8u422-b05-1~24.04-b05) OpenJDK 64-Bit Server VM (build 25.422-b05, mixed mode)

Plugins and Mods

https://paste.ubuntu.com/p/sZncsSj2Zv/

Description

I believe this is an issue of Arclight as I have run the exact same server folder with plain Forge and neither error arises.

During startup the following error is spammed

Startup Error

The server boots fine but when a player logs in and interacts with a block from this mod this error spams console and the player is unable to break or interact with any block. Once they disconnect the server crashes.

Packet Error

Step to reproduce

Install ATM 9 0.3.0 using Arclight Trials 1.0.5

Interact with GregTech block

Logs

Uploading latest.log…

Server pack link (Optional)

https://www.curseforge.com/minecraft/modpacks/all-the-mods-9/download/5564373