code: protected function add_tag_links()
      {
          $tag_id = \get_query_var('tag_id');
          $tag_label = (\single_tag_title('', false) ?: '');
  
          $this->links[] = $this->currentLink($tag_label, \get_tag_link($tag_id));
      }
docs: Called if $page === 'tag'