Can't create project in any group as administrator

I am using gitlab 8.16.0-ce, freshly installed via docker.

As an admin, I would like to import a project into a group (to be able to have proper import of users' comments, see gitlab-ce#25346), but the admin user is not part of the group.

It simply can't do it, the UI does not let the admin user specify the group as a namespace for the new project.

I think an admin should be able to do so.

The group is public and was created by another user. I also noticed that when creating a project as an admin, there was a dropdown list for selecting the namespace, with Users as the header but only root was available under it, even though there is other users on my gitlab instance. I don't see why there would be a dropdown list if there was no possibility to select anything, that's why I suspect it is a bug and not a missing feature.