Navigation breaks when using href on Top-Level toc.yml

[hexxone]

So my top-level toc.yml looks like this:

- name: Home
  href: index.md
- name: Articles
  href: articles/toc.yml
- name: Documentation
  href: sdk/toc.yml
  homepage: sdk/My.Namespace.SDK.yml

when generating with the "modern" template this works correctly and creates dropdowns accordingly :

But it seems with this template there is weird behaviour on the Navigation and the sub-navigation disappears completely:

The weird thing is I didnt see any errors logged in the browser console..

But I will gladly provide more information. Let me know :)