Eventually we should have some sort of handler for this, but this is fine for now

src/main/java/us/myles/ViaVersion/handlers/ViaChunkHandler.java

@@ -4,6 +4,8 @@ import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.MessageToMessageEncoder;
 import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.protocols.base.ProtocolInfo;
+import us.myles.ViaVersion.protocols.protocol1_9to1_8.Protocol1_9TO1_8;
 import us.myles.ViaVersion.protocols.protocol1_9to1_8.storage.ClientChunks;
 
 import java.util.List;
@@ -24,10 +26,12 @@ public class ViaChunkHandler extends MessageToMessageEncoder {
             info.setLastPacket(o);
             /* This transformer is more for fixing issues which we find hard at packet level :) */
             if (o.getClass().getName().endsWith("PacketPlayOutMapChunkBulk") && info.isActive()) {
+                if (info.get(ProtocolInfo.class).getPipeline().contains(Protocol1_9TO1_8.class)) {
                     list.addAll(info.get(ClientChunks.class).transformMapChunkBulk(o));
                     return;
                 }
             }
+        }
 
         list.add(o);
     }