Can published private extensions not be listed in Web Store collection for domain?

[Jonathan de Jong]

I have a few private extensions (published for an internal group). 

We can all access them directly, I can even add them to our Web store collection for our top level group and configure them same way any other published public extension. 

To clarify: I can add it to the web store collection, I can set it to be included, make it possible to install etc. but it will regardless not show up.

Whatever I do our own extensions never show up in the collection: https://chrome.google.com/webstore/category/for_your_domain

I found this thread so I tried also making sure that I have added all images, urls etc etc. but still no dice. https://support.google.com/chrome/a/thread/5370796/why-is-my-published-internal-domain-extension-not-visible-in-web-store-collection-for-domain?hl=en

Am I missing something or is this a weird bug? I shouldnt be able to even add the extension to the collection if private extensions does not support being part of collections. 

Thankful for any insight!