Can't use group members hierarchicaly

[Dahara2012]

What I'm trying to do

I have the same several accounts that I want to include in multiple groups.
My idea was to create a group (e.g., "internal") and add all the relevant accounts to it.
Then, I’d add this "internal" group as a member of other groups to give those accounts access — managing everything from one place instead of adding users individually.

According to the documentation, groups can also be members of other groups and should inherit permissions such as access to shared inboxes.

That’s why I expected this setup to work as described.

What I tried

1. I created a group called "test" and added an account to it.
2. Then, I added the group "test" as a member of another group called "inherit".

Here’s what I expected:

• The account should see the shared inboxes of "test" (since it’s a direct member).
• It should also see the shared inboxes of "inherit" (since "test" is a member of "inherit", and the account is a member of "test").

However, in practice, the account only has access to the shared inbox of "test" and cannot see the shared inbox of "inherit".
All folders are subscribed to in my mail client, and none are hidden.

Now I am wondering:

• is this how it is supposed to work, or
• is it a bug?
• if not can this be achieved differently? (a better way to adding accounts individually to many groups)

[mdecimus]

Although you can create groups inside groups, these do not inherit the access rights of the parent group. Support for adding subgroups is going to be removed to avoid confusion.