Marked forge packets as 'chunk' packets. Giving them a higher priority making the initial mod list check more reliable.

forge/forge_common/net/minecraft/src/forge/packets/ForgePacket.java

@@ -40,6 +40,7 @@ public abstract class ForgePacket
         pkt.channel = "Forge";
         pkt.data    = bytes.toByteArray();
         pkt.length  = pkt.data.length;
+        pkt.isChunkDataPacket = true; //Make our packets higher priority, allowing the initial communication to happen before the client receives all world chunks.
         return pkt;
     }