When the cart consists of two items, and the type of delivery is scheduled, when adding the first item to the cart with free shipping, and it is the same SLA, the checkout ends up charging the value of this shipping, as it does not know how to deal with the calculation distribution of freight values ​​between the items, as it is a scheduled delivery and the window price is for a package as a whole.

Add in the cart 2 itens, and the first one with the freight free, also you need the common SLA for both and scheduled delivery.

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