Tags template do not support index.html override

I have an override for `index.html` template in my `templates` folder and it's working fine with `page.html` template, but for tags, it's ignored.
As a workaround, I have created another template for tags:
```
{% extends "after-dark/templates/tags/list.html" %}

{% block extra_head %}
# ... my changes
{% endblock %}
```

Don't know is this engine problem or template