Setting baseURL in Registrar not working

Yes, thats already mentioned in the docs. There is no value set in .env.
Looks like App can not be extended by an implicit registrar. This ist just possible with the listed callables.


The docs say:

This feature is implemented in the CodeIgniter\Config\BaseConfig class. So it will not work with a few files in the app/Config folder that do not extends the class.

App Configuration is extending BaseConfig so it should be callable. Any plans to extend/fix this in future releases?
Thanks