Since Minecraft changed the server ping packet structure in 1.19.4, the ExternalInvisibility>ServerList features are currently broken (these features were disabled by default). I will work on readding support for these features once ProtocolLib provides stable server ping API again (the new API is currently WIP). This does not affect bungee users, since the bungee-sided serverlist API is separate. Please stay up to date with the latest ProtocolLib dev build.