Fallback to the HANDSHAKING protocol if no packet type is found in the registry (fixes #2601)

Author: nickuc

src/main/java/com/comphenix/protocol/injector/netty/manager/NetworkManagerInjector.java

@@ -112,7 +112,15 @@ public PacketEvent onPacketReceiving(Injector injector, Object packet, NetworkMa
         if (marker != null || inboundListeners.contains(packetClass)) {
             // wrap the packet and construct the event
             PacketType.Protocol currentProtocol = injector.getCurrentProtocol(PacketType.Sender.CLIENT);
-            PacketContainer container = new PacketContainer(PacketRegistry.getPacketType(currentProtocol, packetClass), packet);
+            PacketType packetType = PacketRegistry.getPacketType(currentProtocol, packetClass);
+
+            // if packet type could not be found, fallback to HANDSHAKING protocol
+            // temporary workaround for https://github.com/dmulloy2/ProtocolLib/issues/2601
+            if (packetType == null) {
+                packetType = PacketRegistry.getPacketType(PacketType.Protocol.HANDSHAKING, packetClass);
+            }
+
+            PacketContainer container = new PacketContainer(packetType, packet);
             PacketEvent packetEvent = PacketEvent.fromClient(this, container, marker, injector.getPlayer());
 
             // post to all listeners, then return the packet event we constructed