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<?php
// essentially disable WooCommerce's shipping rates cache
add_filter('woocommerce_checkout_update_order_review', 'clear_wc_shipping_rates_cache');

function clear_wc_shipping_rates_cache(){
	global $wpdb;
	$wpdb->query("DELETE FROM $wpdb->options WHERE option_name LIKE '%wc_ship%'");
}

?>