BEFORE – the Phone field is added by the browser, not by a block
This checkout form contains only Email, Name and Payment. There is no Phone block in the Block Editor, and there is no <sc-customer-phone> tag in the saved page HTML. Even so, a required Phone field appears below, because SureCart adds it in the browser when the checkout needs one. That is why it can never show up in the editor. Notice that it is placed directly above Payment – you cannot move it, rename it, or make it optional.
Block Editor view of this exact form (staff link): Checkout Form #343
