After I have saved the shipment rate quote the shipping address is removed from the customer. This is my code where the line

Basket.GetCheckoutManager().Shipping.SaveShipmentRateQuote(quote);

triggers the shipping address to be removed.

            var billingAddress = sh.GetAddressFromBillingAddress(addressDetails.BillingAddress);
            var shippingAddress = sh.GetAddressFromShippingAddress(addressDetails.ShippingAddress);

            Basket.GetCheckoutManager().Customer.SaveBillToAddress(billingAddress);
            Basket.GetCheckoutManager().Customer.SaveShipToAddress(shippingAddress);



            Basket.GetCheckoutManager().Shipping.ClearShipmentRateQuotes();


            var shipment = Basket.PackageBasket(addressDetails.ShippingAddress);
            if (shipment != null && shipment.Any())
            {

                var quotes = shipment.Last().ShipmentRateQuotes();

                var quote = quotes.FirstOrDefault(q => q.ShipMethod.Key.ToString().Equals(addressDetails.ShippingQuote));

                Basket.GetCheckoutManager().Shipping.SaveShipmentRateQuote(quote);


            }



            Basket.Save();