The code from the mptt documentation doesn't quite work. Where to dig?

Question

Django

In the admin panel, the tree is built without problems. (django_mptt_admin)
In the template, code from the mptt documentation:

<ul class="categories">
    {% recursetree categories %}
      <li>
        {{node.name}}
        {% if not node.is_leaf_node %}
          <ul class="children">
            {{ clildren }}
          </ul>
        {% endif %}
      </li>
    {% endrecursetree %}
  </ul>

The problem is that only the name of the root category is displayed. The rest are not output,
although node.is_leaf_node returns False, i.e. Root has children.
The problem is somewhere in the work of {{ clildren }}, because there are tags in the answer.

Answer 1

{{ clildren }} vs {{ children }}
Isn't it?