1.21.11 – BTLP-Velocity throws error and doesn't work

[snowpegeon]

I'm currently testing various environments while migrating to 1.21.11.
The setup I'm considering right now is as follows:
Paper (1.21.11-123)
Velocity (3.5.0-576)
ValioBungee (0.12.5)
https://www.spigotmc.org/resources/valiobungee.87700/updates

In the above configuration, an error occurs on Velocity.
This issue happens specifically when both ValioBungee and BTLP-Velocity are installed together.The error log is as follows:

[22:24:06 ERROR]: Couldn't pass ServerConnectedEvent to bungeetablistplus 3.6.8-SNAPSHOT java.lang.AssertionError: Received ServerSwitchEvent for non-existent player username at codecrafter47.bungeetablistplus.managers.TabViewManager.onServerConnected(TabViewManager.java:88) ~[?:?] at codecrafter47.bungeetablistplus.managers.Lmbda$19.execute(Unknown Source) ~[?:?] at com.velocitypowered.proxy.event.UntargetedEventHandler$VoidHandler.lambda$buildHandler$0(UntargetedEventHandler.java:56) ~[velocity-3.5.0-SNAPSHOT-576.jar:3.5.0-SNAPSHOT (git-c2fd3c07-b576)] at com.velocitypowered.proxy.event.VelocityEventManager.fire(VelocityEventManager.java:553) ~[velocity-3.5.0-SNAPSHOT-576.jar:3.5.0-SNAPSHOT (git-c2fd3c07-b576)] at com.velocitypowered.proxy.event.VelocityEventManager.lambda$fire$5(VelocityEventManager.java:542) ~[velocity-3.5.0-SNAPSHOT-576.jar:3.5.0-SNAPSHOT (git-c2fd3c07-b576)] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?] at java.base/java.lang.Thread.run(Thread.java:1583) [?:?] [22:24:06 ERROR]: Couldn't pass ServerPostConnectEvent to bungeetablistplus 3.6.8-SNAPSHOT java.lang.AssertionError: Received ServerSwitchEvent for non-existent player username at codecrafter47.bungeetablistplus.managers.TabViewManager.onServerConnected(TabViewManager.java:111) ~[?:?] at codecrafter47.bungeetablistplus.managers.Lmbda$20.execute(Unknown Source) ~[?:?] at com.velocitypowered.proxy.event.UntargetedEventHandler$VoidHandler.lambda$buildHandler$0(UntargetedEventHandler.java:56) ~[velocity-3.5.0-SNAPSHOT-576.jar:3.5.0-SNAPSHOT (git-c2fd3c07-b576)] at com.velocitypowered.proxy.event.VelocityEventManager.fire(VelocityEventManager.java:553) ~[velocity-3.5.0-SNAPSHOT-576.jar:3.5.0-SNAPSHOT (git-c2fd3c07-b576)] at com.velocitypowered.proxy.event.VelocityEventManager.lambda$fire$5(VelocityEventManager.java:542) ~[velocity-3.5.0-SNAPSHOT-576.jar:3.5.0-SNAPSHOT (git-c2fd3c07-b576)] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144) ~[?:?] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642) ~[?:?] at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]

Questions: What is the root cause of this error? Is it coming from BTLP-Velocity or ValioBungee (or the combination of both)?
Is this the kind of problem that can be resolved relatively quickly?

Could you please take a look?
Thanks in advance.

[Andre601]

The error describes it fairly clearly.
BTLP received a ServerSewitchEvent for an unknown playername.

This afaik is usually due to the player not joining through the proxy and not being recorded, but I may be wrong here.

The error should be harmless tho and not break or affect the tab for most players from what I know.

[snowpegeon]

My current setup uses ValioBungee to make multiple proxies (such as Velocity and others) appear and function as a single unified network.
Right now, since this is still in the preliminary research phase, ValioBungee has several BungeeCord instances and one Velocity instance connected to it.In the future, I plan to place multiple Velocity proxies within the same network and create a single, network-wide integrated Tab list that combines players across all of them.
(Currently using 1.21.4 + multiple BungeeCord instances)
I am aware that BTLP-BungeeCord has integration / support for working with ValioBungee .
Does the BTLP-Velocity version have any equivalent integration or support for ValioBungee (or comparable multi-proxy synchronization)?