Remove invalid optimization in ItemStackHandler#setStackInSlot #3465

src/main/java/net/minecraftforge/items/ItemStackHandler.java

@@ -56,8 +56,6 @@ public class ItemStackHandler implements IItemHandler, IItemHandlerModifiable, I
     public void setStackInSlot(int slot, @Nonnull ItemStack stack)
     {
         validateSlotIndex(slot);
-        if (ItemStack.areItemStacksEqual(this.stacks.get(slot), stack))
-            return;
         this.stacks.set(slot, stack);
         onContentsChanged(slot);
     }