Work around kqueue transport bug with fallback connections.

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

@@ -404,7 +404,9 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
     }
 
     if (connectedServer == null) {
-      // The player isn't yet connected to a server.
+      // The player isn't yet connected to a server. Note that we need to do this in a future run
+      // of the event loop due to an issue with the Netty kqueue transport.
+      minecraftConnection.eventLoop().execute(() -> {
         Optional<RegisteredServer> nextServer = getNextServerToTry(rs);
         if (nextServer.isPresent()) {
           // There can't be any connection in flight now.
@@ -413,6 +415,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
         } else {
           disconnect(friendlyReason);
         }
+      });
     } else {
       boolean kickedFromCurrent = connectedServer.getServer().equals(rs);
       ServerKickResult result;