Chunks missing client-side when connecting via proxy

[jedenastka]

Describe the bug

When connecting via the proxy, chunks sometimes disappear from the client (see attached screenshot). This makes it hard to do proper captures. The resulting worlds are completely fine, however.

This does not happen if not connecting via the proxy.

For some reason, I cannot get this to occur when using -extra-debug, to the point where I use the flag as a workaround for this issue. That said, I can easily reproduce this with a regular capture, which I can attach if it's either fine to share publicly or if you can share your public GPG key.

To Reproduce

1. Run either worlds or capture subcommand without -extra-debug and connect to the server
2. Travel around the world, chances are you will find a missing chunk in 5 minutes or less

Expected behavior

All chunks load on the client.

Screenshots

Desktop (please complete the following information):

• OS: Debian GNU/Linux Unstable
• Version: 1.39.1-32
• Minecraft Version: 1.21.2 (unofficial Linux launcher)

Additional context

None.

attach packets.log.gpg (not always necessary)

Cannot reproduce with -extra-debug.

[Lioncat6]

I can reproduce this issue with -extra-debug if that helps at all.

Note, I've only seen this issue on Gatherings servers.