Describe the bug When I extend nunjuck layout, pagination doesn't work

To Reproduce

{% extends "layouts/default.njk" %}

---
pagination:
  data: categories
  size: 1
  alias: category
eleventyComputed:
  title: "{{ category.name }}"
---

{% block content %}

    {%- for category in categories %}
    
        <h1>{{ category.name }}</h1>
    
    {% endfor -%}

{% endblock %}

Expected behavior It should generate the categories pages

Screenshots the result file is empty

Environment:

• OS and Version: Windows 10
• Eleventy Version 0.12.1

Additional context Add any other context about the problem here.