Lets go

plugin/src/main/java/com/craftmend/openaudiomc/bungee/modules/player/listeners/PlayerConnectionListener.java

@@ -20,6 +20,14 @@
  */
 public class PlayerConnectionListener implements Listener {
 
+    // We need a weird workaround here for https://github.com/SpigotMC/BungeeCord/issues/3542
+    // 1.20.2+ players hava an additional configuration phase that we need to work around. So for the first event
+    // we need to fire, and for the second we can mock a server switch.
+    // We'll use a cache for this, with a retention of 20 seconds
+    // which should be enough to cover resource pack loading but long enough to mitigate memory leaks.
+    // This also means that the player might not yet be online in a server, in which case we'll have to delay the entire event or
+    // outright ignore it, hoping for another one soon.
+
     @EventHandler
     public void onPostLogin(PostLoginEvent event) {
         OpenAudioMc.getService(NetworkingService.class).register(new BungeeUserAdapter(event.getPlayer()), null);
@@ -32,6 +40,8 @@ public void onLogout(PlayerDisconnectEvent event) {
 
     @EventHandler
     public void onSwitch(ServerSwitchEvent event) {
+        if (!OpenAudioMc.getService(NetworkingService.class).hasClient(event.getPlayer().getUniqueId())) return;
+
         new BungeeProxyNode(event.getPlayer().getServer().getInfo()).sendPacket(new AnnouncePlatformPacket(
                 OpenAudioMc.getService(AuthenticationService.class).getServerKeySet().getPublicKey().getValue(),
                 Platform.BUNGEE

plugin/src/main/java/com/craftmend/openaudiomc/bungee/utils/BungeeUtils.java

@@ -0,0 +1,24 @@
+package com.craftmend.openaudiomc.bungee.utils;
+
+import net.md_5.bungee.UserConnection;
+import net.md_5.bungee.api.connection.ProxiedPlayer;
+
+public class BungeeUtils {
+
+    public static boolean doesUserHaveConfigPhase(ProxiedPlayer player) {
+        UserConnection connection = (UserConnection) player;
+        // check if protocol is 764 or higher
+        return connection.getPendingConnection().getVersion() >= 764;
+    }
+
+    public static boolean serverSupportsConfigurationPhase() {
+        // check if the class net.md_5.bungee.protocol.packet.StartConfiguration exists
+        try {
+            Class.forName("net.md_5.bungee.protocol.packet.StartConfiguration");
+            return true;
+        } catch (ClassNotFoundException e) {
+            return false;
+        }
+    }
+
+}

plugin/src/main/java/com/craftmend/openaudiomc/generic/networking/interfaces/NetworkingService.java

@@ -32,6 +32,7 @@ public void onEnable() {
     public abstract ClientConnection register(User player, @Nullable SerializableClient importData);
     public abstract Set<INetworkingEvents> getEvents();
     public abstract ClientConnection getClient(UUID uuid);
+    public abstract boolean hasClient(UUID uuid);
     public abstract Collection<ClientConnection> getClients();
     public abstract int getThroughputPerSecond();