ensure 'wc_fragment_refresh' is triggered when woocommerce add to cart blocks are used.

code.php

<?php

add_action( 'wp_enqueue_scripts', 'ensure_wc_cart_fragments', 20 );
function ensure_wc_cart_fragments() {
    wp_enqueue_script( 'wc-cart-fragments' );
}


add_action('wp_enqueue_scripts', 'custom_enqueue_cart_refresh_script');
function custom_enqueue_cart_refresh_script() {
    wp_add_inline_script('wc-cart-fragments', "
        document.addEventListener('wc-blocks_added_to_cart', function(event) {
          jQuery(document.body).trigger('wc_fragment_refresh');
        });
    ");
}