Move registration to be performed earlier.

proxy/src/main/java/com/velocitypowered/proxy/connection/client/LoginSessionHandler.java

@@ -40,6 +40,7 @@ import java.security.GeneralSecurityException;
 import java.security.KeyPair;
 import java.util.Arrays;
 import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ThreadLocalRandom;
 import net.kyori.text.Component;
 import org.apache.logging.log4j.LogManager;
@@ -228,6 +229,11 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
           apiInbound.getVirtualHost().orElse(null));
       this.connectedPlayer = player;
 
+      if (!server.registerConnection(player)) {
+        player.disconnect(VelocityMessages.ALREADY_CONNECTED);
+        return CompletableFuture.completedFuture(null);
+      }
+
       return server.getEventManager()
           .fire(new PermissionsSetupEvent(player, ConnectedPlayer.DEFAULT_PERMISSIONS))
           .thenCompose(event -> {
@@ -261,11 +267,6 @@ public class LoginSessionHandler implements MinecraftSessionHandler {
       return;
     }
 
-    if (!server.registerConnection(player)) {
-      player.disconnect(VelocityMessages.ALREADY_CONNECTED);
-      return;
-    }
-
     int threshold = server.getConfiguration().getCompressionThreshold();
     if (threshold >= 0) {
       inbound.write(new SetCompression(threshold));

proxy/src/main/java/com/velocitypowered/proxy/connection/client/StatusSessionHandler.java

@@ -38,9 +38,8 @@ public class StatusSessionHandler implements MinecraftSessionHandler {
   public boolean handle(StatusRequest packet) {
     VelocityConfiguration configuration = server.getConfiguration();
 
-    int shownVersion = ProtocolConstants.isSupported(connection.getProtocolVersion()) ? connection
-        .getProtocolVersion() :
-        ProtocolConstants.MAXIMUM_GENERIC_VERSION;
+    int shownVersion = ProtocolConstants.isSupported(connection.getProtocolVersion())
+        ? connection.getProtocolVersion() : ProtocolConstants.MAXIMUM_GENERIC_VERSION;
     ServerPing initialPing = new ServerPing(
         new ServerPing.Version(shownVersion,
             "Velocity " + ProtocolConstants.SUPPORTED_GENERIC_VERSION_STRING),