In the cart that already has a delivery item scheduled and selected, with its address filled in, when arriving at the payment stage and adding a payment method that adds a free gift to the cart and this gift also has scheduled delivery, the user is returned to stage of choosing the scheduled delivery, but the gift ends up "taking" the date that had been previously filled in for the first item. When analyzing the API, the deliveryWindow of this gift remains as null and making it impossible for the user to proceed to the payment step. Since clicking the button nothing happens.

Note: if the user changes the date in the date selection, an update occurs and the deliveryWindow is filled, with that the user is able to go to the payment step.

Have a cart with an item with scheduled delivery, fill in your details normally, choose the delivery date, when you get to the payment stage, choose a payment method that adds a gift, the checkout will return to the scheduled delivery date selection stage, so if the user clicks on the proceed button, he will not be able to, only if he changes the date of this gift.

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