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Did you add the "items" label to the slot. Because that's not a default expression. Other than that the code looks like you are trying to count the amount of items of a specific type in the slot. But due to the matching labels condition items with a different type can't be in the slot in the first place, no?
You can check how many items are assigned to a slot through the slotItems property of the slot class. So to limit the total quantity per slot you would just add "slot.slotItems.length < 2" to the condition.
If I add the "slot.slotItems.length <2" it still doesn't work.. here is my testfile.
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