The quantity in the cart icon is not updating.

Hi everyone, maybe you can help me figure out the problem. I’ve been struggling with it for three hours already, and the same code worked fine on other projects.

Here’s the code for the icon in the header.

<?php $cart_url = get_permalink( wc_get_page_id( 'cart' ) ); ?>

<a href="<?php echo esc_url( $cart_url ); ?>" class="nav__cart "><span>
      <?php echo count( WC()->cart->get_cart() ); ?></span></a>

Here’s the filter for updates.

add_filter( 'woocommerce_add_to_cart_fragments', 'woocommerce_header_add_to_cart_fragment' );

function woocommerce_header_add_to_cart_fragment( $fragments ) {
	global $woocommerce;

	ob_start();

	 $cart_url = get_permalink( wc_get_page_id( 'cart' ) ); 
?>

I took everything from the documentation.
Here’s what the AJAX returns.

{
    "fragments": {
        "div.widget_shopping_cart_content": "<div class=\"widget_shopping_cart_content\">\n\n\t<ul class=\"woocommerce-mini-cart cart_list product_list_widget \">\n\t\t\t\t\t\t<li class=\"woocommerce-mini-cart-item mini_cart_item\">\n\t\t\t\t\t<a href=\"https:\/\/shop.loc\/cart\/?remove_item=060ad92489947d410d897474079c1477&_wpnonce=48641d5529\" class=\"remove remove_from_cart_button\" aria-label=\"\u0412\u0438\u0434\u0430\u043b\u0438\u0442\u0438 SAGUARO 1 \u0437 \u043a\u043e\u0448\u0438\u043a\u0430\" data-product_id=\"221\" data-cart_item_key=\"060ad92489947d410d897474079c1477\" data-product_sku=\"11153\" data-success_message=\"&quot;SAGUARO 1&quot; \u0432\u0438\u0434\u0430\u043b\u0435\u043d\u043e \u0437 \u0432\u0430\u0448\u043e\u0433\u043e \u043a\u043e\u0448\u0438\u043a\u0430\">&times;<\/a>\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/shop.loc\/product\/saguaro-1\/\">\n\t\t\t\t\t\t\t<img width=\"150\" height=\"150\" src=\"https:\/\/shop.loc\/wp-content\/uploads\/2024\/09\/katalog-img1-150x150.webp\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/shop.loc\/wp-content\/uploads\/2024\/09\/katalog-img1-150x150.webp 150w, https:\/\/shop.loc\/wp-content\/uploads\/2024\/09\/katalog-img1-100x100.webp 100w, https:\/\/shop.loc\/wp-content\/uploads\/2024\/09\/katalog-img1-50x50.webp 50w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/>SAGUARO 1\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"quantity\">2 &times; <span class=\"woocommerce-Price-amount amount\"><bdi>120 240&nbsp;<span class=\"woocommerce-Price-currencySymbol\">\u0433\u0440\u043d<\/span><\/bdi><\/span><\/span>\t\t\t\t<\/li>\n\t\t\t\t\t<\/ul>\n\n\t<p class=\"woocommerce-mini-cart__total total\">\n\t\t<strong>\u0420\u0430\u0437\u043e\u043c:<\/strong> <span class=\"woocommerce-Price-amount amount\"><bdi>240 480&nbsp;<span class=\"woocommerce-Price-currencySymbol\">\u0433\u0440\u043d<\/span><\/bdi><\/span>\t<\/p>\n\n\t\n\t<p class=\"woocommerce-mini-cart__buttons buttons\"><a href=\"https:\/\/shop.loc\/cart\/\" class=\"button wc-forward\">\u041f\u0435\u0440\u0435\u0433\u043b\u044f\u043d\u0443\u0442\u0438 \u043a\u043e\u0448\u0438\u043a<\/a><a href=\"https:\/\/shop.loc\/checkout\/\" class=\"button checkout wc-forward\">\u041e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044f \u0437\u0430\u043c\u043e\u0432\u043b\u0435\u043d\u043d\u044f<\/a><\/p>\n\n\t\n\n<\/div>",
        "a.nav__cart": "\n\n<a href=\"https:\/\/shop.loc\/cart\/\" class=\"nav__cart \"><span>\n      1<\/span><\/a>\n\n",
        ".woocommerce-notices-wrapper": "<div class=\"woocommerce-notices-wrapper\">\n\t<div class=\"woocommerce-message\" role=\"alert\">\n\t\t&ldquo;SAGUARO 1&rdquo; \u0434\u043e\u0434\u0430\u043d\u043e \u0434\u043e \u043a\u043e\u0448\u0438\u043a\u0430. <a href=\"https:\/\/shop.loc\/cart\/\" class=\"button wc-forward\">\u041f\u0435\u0440\u0435\u0433\u043b\u044f\u043d\u0443\u0442\u0438 \u043a\u043e\u0448\u0438\u043a<\/a>\t<\/div>\n<\/div>"
    },
    "cart_hash": "ac859f6b00313d9e09cb7af099f16993"
}

Help me find the issue with why the quantity update in the cart icon isn’t working.