NeoForge 1.20.4 Crash on Startup

[AzureDoom]

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

arclight-neoforge-1.20.4-1.0.3-SNAPSHOT

OS & Java versions

Linux, Java 17

Plugins and Mods

None, this is a barebones install test.

Description

The server does not start up due to Duplicate key issue.

Step to reproduce

1. Run server.
2. Crash on startup

Logs

https://gist.github.com/AzureDoom/99fcf3358bdbc08b82dea7ddcca643f3

Server pack link (Optional)

No response