Ping-Passthrough not working

[MindStudioOfficial]

I have a Velocity 3.4.0-SNAPSHOT-451 proxy running with a FABRIC server and a PAPER server behind it.
player-info-forwarding-mode = "modern"
ping-passthrough = "all"

For the Paper server it correctly shows the icon and MOTD
For the Fabric server it shows the velocity icon and MOTD
When adding the fabric server directly it shows the correct icon and motd

I can still connect through velocity though so it is not a connection issue
I am using the default FabricProxy-Lite.toml config with the secret added.

Whenever I press "Refresh" in the server list I get this error in the Fabric server logs

[10:58:37] [Netty Epoll Server IO #2/ERROR]: Exception occurred in netty pipeline

io.netty.channel.unix.Errors$NativeIoException: recvAddress(..) failed: Connection reset by peer

[MindStudioOfficial]

The reason for this error was the mod "Better Compatibility Checker"
After removing it the ping passthrough worked again.
I think the mod modifies the messages sent and velocity can't process them.

Possibly related to nanite/BetterCompatibilityChecker#34

Leaving this here in case anyone thinks this mod is responsible for the error.