It's possible to exclude the first gift from their cart if you use 2 Buy X Get Y rewards - this is because Shopify has a limitation where only one BXGY can work in an order.
What this means is that the first tier will get cancelled out by the 2nd when they reach it.
Important note: the item will no longer be free but it would still be in the customer's cart. This is because they are technically above the threshold, so Unicorn doesn't know it should remove it.
so, what brands can do as a workaround in the meantime is edit the 'error' message on gift 1 to say ' only 1 gift per order, please remove from cart'
here is an example:
