Вот вам с микроразметкой Schema.org рабочий вариант
<ul class="breadcrumb" itemscope itemtype="https://schema.org/BreadcrumbList">
{% for key, breadcrumb in breadcrumbs %}
{% if key + 1 < breadcrumbs|length %}
<li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem">
<a itemscope itemtype="https://schema.org/Thing" itemprop="item" href="{{ breadcrumb.href }}"><span itemprop="name">{{ breadcrumb.text }}</span></a>
<meta itemprop="position" content="{{key+1}}" />
</li>
{% else %}
<li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"><span itemprop="name">{{ breadcrumb.text }}</span>
<meta itemprop="position" content="{{key+1}}" />
</li>
{% endif %}
{% endfor %}
</ul>