I have a file that looks like this:

* Heading 1
** TODO [#A] Item 1
* Heading 2
** TODO Item 2
* TODO Heading 3

I have org-super-agenda-groups set like this:

(setq org-super-agenda-groups
      '((:priority "A")
        (:auto-outline-path t)))

The agenda output looks like this:

 Priority A items
  org-super-agenda-test:TODO [#A] Item 1
  org-super-agenda-test:TODO Heading 3

 Heading 2
  org-super-agenda-test:TODO Item 2

It visually looks like "Heading 3" is part of the Priority A group, which is a bit confusing. Ideally, it would be nice if there was some name for the root heading instead of it being blank, i.e.:

 Priority A items
  org-super-agenda-test:TODO [#A] Item 1
  
 <ROOT>  
  org-super-agenda-test:TODO Heading 3

 Heading 2
  org-super-agenda-test:TODO Item 2

And maybe there's a better default heading than <ROOT>, I don't know or have a strong preference.

A less ideal alternative would be if there was just a bit of extra blank space between the outline-path group and the previous group.