1.18.2/1.20.1 block collision lag

[Shybella]

I have confirmed that ...

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

Arclight version

1.20.1/1.18.2

OS & Java versions

JDK17/Windows Server 2022

Plugins and Mods

Direwolf20 1.20.1/BetterMC [Forge] 1.20.1

Description

On login, randomly, the player will cause an insane amount of block collisions causing the server to hang.

This is isolated to Arclight as this does not happen with Arclight not installed.

https://i.imgur.com/nc1K46Q.png (VisualVM debug)

Step to reproduce

1. Cannot reproduce, happens randomly.

Logs

No response

Server pack link (Optional)

https://www.curseforge.com/minecraft/modpacks/dawn-craft

[Shybella]

This has been happening on every Arclight server I run, doesn't matter the mods or modpacks. I handle a lot of players so these kinds of issues never really crop up for people, this needs resolved.

[Shybella]

If I set all players to spectator on login and then swap their gamemode after 10ish seconds back to survival the issue stops. This only occurs on login.