java.lang.ArrayIndexOutOfBoundsException: 63

[gre3x]

/viaversion dump Output

https://dump.viaversion.com/08588726e91c47e8b8d623b8a3786103aa74cc76cb94575af2ac82c474c9c73e

Console Error

https://paste.gg/p/anonymous/99f8a921c8f74d529fefa3b0803a6b67

Bug Description

My server crashes and sends a ton of console errors when 10+ people join it at the same time. This did not happen before I updated ViaVersion to support 1.20.4. I made no other changes to the server to cause this issue other than updating ViaVersion. This has happened many times over the last 1.5 months (about once per day)

Steps to Reproduce

1. Have 10+ players connect to the server at about the same time
2. Observe console errors and crash

Expected Behavior

Server does not crash and there are no console errrors

Additional Server Info

Paper 1.12 Waterfall 1.20-582 ViaVersion on the backend

Checklist

• [X] Via plugins are only running on EITHER the backend servers (e.g. Paper) OR the proxy (e.g. BungeeCord), not on both.
• [X] I have included a ViaVersion dump.
• [X] If applicable, I have included a paste (not a screenshot) of the error.
• [X] I have tried the latest build(s) from https://ci.viaversion.com/ and the issue still persists.

[Barvalg]

[gre3x]

Full error logs: 2024-02-11-1.zip

[gre3x]

This is continuing to happen daily. Is there anything I can do to help resolve this or get this reviewed?

[Kichura]

Either vulcan_ae or another third-party plugin is pushing out bad entity metadata to server which makes viaversion complain about it.