I’ve just finished configuring the groups and permissions. It’s a little bit strange, because the Gitlab interface doesn’t show the group members in the project members.
As a result, when you look at the list of project members, you get the impression that there are no developers or maintainers:
However, in the groups tab, the project’s member groups are clearly visible:
If you consult the members of these groups, you’ll find the people you’re looking for:
I therefore think that you have the required access rights and that there is no regression compared with the previous configuration. But please check it out and let me know if you encounter any issues.
Here is the Gitlab documentation on the subject: Share a project with a group