Add .html to product permalinks

/**
 * Add .html extension to product permalinks
 */
function bis_detect_html_permalinks($query) {
  global $wpdb, $pm_query, $wp, $wp_rewrite;

  // Do not run if custom permalink was detected
  if(!empty($pm_query['id'])) {
    return $query;
  }

  if(!empty($query['product']) && strpos($query['product'], '.html') !== false) {
        $query['product'] = str_replace('.html', '', $query['product']);

        if(!empty($query['name'])) {
            $query['name'] = $query['product'];
        }

    // Disable canonical redirect
    remove_action('template_redirect', 'wp_old_slug_redirect');
    remove_action('template_redirect', 'redirect_canonical');
    add_filter('wpml_is_redirected', '__return_false', 99, 2);
    add_filter('pll_check_canonical_url', '__return_false', 99, 2);
  }

  return $query;
}
add_filter('request', 'bis_detect_html_permalinks', 9999);

function bis_filter_product_permalinks($url, $element) {
    if(!empty($element->post_type) && ($element->post_type == 'product')) {
        $url .= ".html";
    }

    return $url;
}
add_filter('post_type_link', 'bis_filter_product_permalinks', 999, 2);