Bug: Unable to add owners / members to a new Office 365 group containing only one user (owner)

I think the problem is the "counter". It always reports one less members then it actually is. So if there is only 1 owner then SharePoint probably count it as 0 and just hide it.

I can't find any place in Outlook where you can add new members when you're the only one having access to the group. I don't get the group in the "groups" section. And if you "discover" new groups and try to find the group you get the option to "Ask to become a member"! (when you already is the owner!) Yes I've check the admin and I'm the owner of that group and I get access to the SharePoint site as well.

The bug is on new and (weeks) old Office 365 groups! This issue has been like this for some weeks now.  We noticed the problem after we deployed a "order-system" for new Office 365 groups and Teams. Got the same issue when creating new Office 365 groups in the standard UI.