WooCommerce cart fragments isn't updated after ajax adding items - wordpress

Question

This is the code that I have on my products page template.
<p>Your total: <span class="r_cart_total"><?= WC()->cart->get_cart_total(); ?></span></p>
So whenever a product is added to cart, I have a filter that works
add_filter( 'woocommerce_add_to_cart_fragments', 'wc_refresh_cart_fragments', 50, 1 );
function wc_refresh_cart_fragments( $fragments ){
$cart_count = WC()->cart->get_cart_contents_count();
$cart_total = WC()->cart->get_cart_total();
// Normal version
$count_normal = '<span class="r_cart_total">' . $cart_total . '</span>';
$fragments['.r_cart_total'] = $count_normal;
return $fragments;
}
According to this function I am updating the span content with class '.r_cart_total'.
This function works fine when an item is removed from the cart, but whenever I add a product to cart the fragments do not get updated.
Here is the add to cart function
/**
* Add to cart product using ajax
**/
add_action('wp_ajax_woocommerce_ajax_add_to_cart', 'woocommerce_ajax_add_to_cart');
add_action('wp_ajax_nopriv_woocommerce_ajax_add_to_cart', 'woocommerce_ajax_add_to_cart');
function woocommerce_ajax_add_to_cart() {
$product_id = apply_filters('woocommerce_add_to_cart_product_id', absint($_POST['product_id']));
$quantity = empty($_POST['quantity']) ? 1 : wc_stock_amount($_POST['quantity']);
$variation_id = absint($_POST['variation_id']);
$passed_validation = apply_filters('woocommerce_add_to_cart_validation', true, $product_id, $quantity);
$product_status = get_post_status($product_id);
$is_buy_all = filter_var($_POST['is_buy_all'], FILTER_VALIDATE_BOOLEAN);
//if buy all product then remove all other products in the cart
if($is_buy_all){
foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
WC()->cart->remove_cart_item( $cart_item_key );
}
}
if ($passed_validation && WC()->cart->add_to_cart($product_id, $quantity, $variation_id) && 'publish' === $product_status) {
do_action('woocommerce_ajax_added_to_cart', $product_id);
//show success message add to cart
if ('yes' === get_option('woocommerce_cart_redirect_after_add')) {
wc_add_to_cart_message(array($product_id => $quantity), true);
}
if($is_buy_all && !empty($_POST['sub_products'])){
$sub_products = json_decode(stripslashes($_POST['sub_products']));
foreach($sub_products as $sub_product){
$sub_product = trim($sub_product);
$sub_product_id = apply_filters('woocommerce_add_to_cart_product_id', absint($sub_product));
$quantity = 1;
$variation_id = absint($variation_id);
$passed_validation = apply_filters('woocommerce_add_to_cart_validation', true, $sub_product_id, $quantity);
$sub_product_status = get_post_status($sub_product_id);
if($passed_validation && WC()->cart->add_to_cart($sub_product_id, $quantity) && 'publish' === $sub_product_status) {
do_action('woocommerce_ajax_added_to_cart', $sub_product_id);
}
}
}
WC_AJAX :: get_refreshed_fragments();
wp_die();
} else {
$data = array(
'error' => true,
'product_url' => apply_filters('woocommerce_cart_redirect_after_error', get_permalink($product_id), $product_id));
echo wp_send_json($data);
wp_die();
}
}