WooCommerce: Retain Field Values @ Checkout Reload

/**
 * @snippet       Retain Field Values | WooCommerce Checkout
 * @how-to        Get tutoraspire.com FREE
 * @author        Tutor Aspire
 * @testedwith    WooCommerce 6
 * @donate $9     https://www.tutoraspire.com
 */

add_action( 'woocommerce_checkout_update_order_review', 'tutoraspire_save_checkout_values', 9999 );

function tutoraspire_save_checkout_values( $posted_data ) {
 parse_str( $posted_data, $output );
    WC()->session->set( 'checkout_data', $output );
}

add_filter( 'woocommerce_checkout_get_value', 'tutoraspire_get_saved_checkout', 9999, 2 );

function tutoraspire_get_saved_checkout( $value, $index ) {
    $data = WC()->session->get( 'checkout_data' );
    if ( ! $data || empty( $data[$index] ) ) return $value;
    return is_bool( $data[$index] ) ? (int) $data[$index] : $data[$index];
}

add_filter( 'woocommerce_ship_to_different_address_checked', 'tutoraspire_get_saved_ship_to_different' );

function tutoraspire_get_saved_ship_to_different( $checked ) {
    $data = WC()->session->get( 'checkout_data' );
    if ( ! $data || empty( $data['ship_to_different_address'] ) ) return $checked;
    return true;
}