Drop expired packets in the processing chain.

ProtocolLib/src/main/java/com/comphenix/protocol/async/AsyncListenerHandler.java

@@ -441,6 +441,7 @@ public class AsyncListenerHandler {
 				}
 				
 				// Now, get the next non-cancelled listener
+				if (!marker.hasExpired()) {
 					for (; marker.getListenerTraversal().hasNext(); ) {
 						AsyncListenerHandler handler = marker.getListenerTraversal().next().getListener();
 						
@@ -449,6 +450,7 @@ public class AsyncListenerHandler {
 							continue mainLoop;
 						}
 					}
+				}
 				
 				// There are no more listeners - queue the packet for transmission
 				filterManager.signalFreeProcessingSlot(packet);