Fixed spawners showing the correct mob

src/main/java/us/myles/ViaVersion/transformers/OutgoingTransformer.java

@@ -1,12 +1,19 @@
 package us.myles.ViaVersion.transformers;
 
 import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufInputStream;
+import io.netty.buffer.ByteBufOutputStream;
+
 import org.bukkit.entity.EntityType;
 import org.json.simple.JSONObject;
 import org.json.simple.parser.JSONParser;
 import org.json.simple.parser.ParseException;
 import org.spacehq.mc.protocol.data.game.chunk.Column;
 import org.spacehq.mc.protocol.util.NetUtil;
+import org.spacehq.opennbt.NBTIO;
+import org.spacehq.opennbt.tag.builtin.CompoundTag;
+import org.spacehq.opennbt.tag.builtin.StringTag;
+
 import us.myles.ViaVersion.CancelException;
 import us.myles.ViaVersion.ConnectionInfo;
 import us.myles.ViaVersion.ViaVersionPlugin;
@@ -20,6 +27,8 @@ import us.myles.ViaVersion.util.EntityUtil;
 import us.myles.ViaVersion.util.PacketUtil;
 import us.myles.ViaVersion.util.ReflectionUtil;
 
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
 import java.io.IOException;
 import java.util.*;
 
@@ -545,6 +554,32 @@ public class OutgoingTransformer {
             output.writeBytes(input);
             return;
         }
+        if (packet == PacketType.PLAY_UPDATE_BLOCK_ENTITY) {
+        	long[] pos = PacketUtil.readBlockPosition(input);
+        	int action = input.readUnsignedByte();
+        	if(action == 1) { // update spawner
+        		try {
+        			DataInputStream stream = new DataInputStream(new ByteBufInputStream(input));
+					CompoundTag tag = (CompoundTag) NBTIO.readTag(stream);
+					String entity = (String) tag.get("EntityId").getValue();
+					CompoundTag spawn = new CompoundTag("SpawnData");
+					spawn.put(new StringTag("id", entity));
+					tag.put(spawn);
+					PacketUtil.writeBlockPosition(output, pos[0], pos[1], pos[2]);
+					output.writeByte(action);
+					DataOutputStream out = new DataOutputStream(new ByteBufOutputStream(output));
+					NBTIO.writeTag(out, tag);
+				} catch (IOException e) {
+					// TODO Auto-generated catch block
+					e.printStackTrace();
+				}
+        		return;
+        	}
+        	PacketUtil.writeBlockPosition(output, pos[0], pos[1], pos[2]);
+			output.writeByte(action);
+			output.writeBytes(input, input.readableBytes());
+			return;
+        }
         if (packet == PacketType.PLAY_CHUNK_DATA) {
             // We need to catch unloading chunk packets as defined by wiki.vg
             // To unload chunks, send this packet with Ground-Up Continuous=true and no 16^3 chunks (eg. Primary Bit Mask=0)