During the checkout stage, in the step of filling in the shipping data, by clicking on the option "Deliver to another address", if no address is added and the shopper comes back to the address list (using the button "back to address book") the button "Go to payment" disappears.

• During the Checkout stage, when filling in the shipping data, if there is a list of addresses, click on "Deliver to another address";
• Do not add any address and return to the shipping data by clicking on the "Back to address list" button;
• The "Go to payment" button disappears.

For the button to be displayed again, just click on one of the addresses in the address book. However, there is no workaround to prevent this behavior.