error when switching in between 1.8.8 and 1.20.1 servers on a Waterfall proxy

[random-tek]

/viaversion dump Output

https://dump.viaversion.com/e463da18d1f902bc16263cc5fc191fe92e7c03dafbabb4845a393b9fef245f72

Console Error

https://paste.gg/p/anonymous/96b404149fd84a568c68dd4ab6dd8c53

Bug Description

The proxy console outputs this error every time someone switches in between servers that have different versions (Paper 1.8.8 as the lobby and Paper 1.20.1 as a survival server). When switching from the lobby to the survival, the player does get switched over, however the error still occurs. It even gives out the same error when switching back to the lobby, but the player gets stuck in a void this time, as shown in this image below:

Steps to Reproduce

1. Set up a 1.20 Waterfall proxy with two Paper servers (1.8.8 and 1.20.1)
2. Add ViaVersion to the "plugins" folder in the proxy
3. Join the server on a 1.20.1 client or higher
4. Switch in between servers using "/server servernamehere" and the error should appear in the Waterfall console.

Expected Behavior

The error should'nt have occured and get the player stuck in a void while switching servers.

Additional Server Info

The Waterfall proxy also has the "VersionControl-1.3.4.jar" plugin in order to prevent players playing below 1.20 to connect to the newer server.

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]

Please update all Via* plugins from https://ci.viaversion.com/. In case the issue still persists send the new dump and the issue will be reopened

corrupt_jar

[random-tek]

New dump with 4.9.3-SNAPSHOT https://dump.viaversion.com/16969991af9b86d16287e669be8736a6698626407d00e2673991f4e088f34ad0

[Barvalg]

[Kichura]

Can you test with an vanilla client to see if it persists? if it does then a third-party plugin is causing chunks to not load as intended.

[random-tek]

Can you test with an vanilla client to see if it persists? if it does then a third-party plugin is causing chunks to not load as intended.

The issue still persists with a vanilla client AND with all of the third-party plugins removed.

[Kichura]

will try to investigate this then.

[Kichura]

Cannot reproduce your problem:

Is the world save bad perhaps? because something isn't adding up.

[random-tek]

Is the world save bad perhaps? because something isn't adding up.

I tried regenerating the world save. This time I also set online-mode=true in the proxy's config.yml. Once I did that, the results were different. I was sent to the 1.20.1 server instead of the lobby, and got this error when switching over to the lobby: Same results after setting online-mode back to false.

[Kichura]

Can you test viaversion on spigot/paper servers instead of waterfall to see if it recovers at all? if yes; then something is making viaversion break on proxy side.

[random-tek]

I moved the plugin from the proxy over to both servers. It does indeed work as intended - no errors at all.

However, I wouldn't be able to use the VersionControl addon since it's a proxy-sided plugin.