--- a/net/minecraft/network/play/client/CCreativeInventoryActionPacket.java
+++ b/net/minecraft/network/play/client/CCreativeInventoryActionPacket.java
@@ -32,7 +32,7 @@
 
    public void func_148840_b(PacketBuffer p_148840_1_) throws IOException {
       p_148840_1_.writeShort(this.field_149629_a);
-      p_148840_1_.func_150788_a(this.field_149628_b);
+      p_148840_1_.writeItemStack(this.field_149628_b, false); //Forge: Include full tag for C->S
    }
 
    public int func_149627_c() {
