Addres data not sent on first load of the Checkout page

[agostino_vagni]

When I insert my address on the checkout page for the first time these data are passed to estimate-shipping-metods:

address: {country_id: "US", postcode: null}

but if i reload the page "https://domain/checkout" it sends all the correct data:

address: {street: ["Via Enrico Fermi 5 Manerbio"], city: "Manerbio", region: "", country_id: "IT",…}