Mail folders in public(sharedFolderNamespaces) namespace has owner "nobody"
Procedure aclsForUser read acls only when "owner isEqualToString: userLogin"
So its never read acls of folders in public namespace

We can set acls for folders in public name space but cannot lookup them.

This is for superuser (user in SOGoSuperUsernames)

For ordinary user we can see list of users in acls but cant see rights for user.
instead we see not friendly message
"An error occurred during object publishing
tried to access private object (0x0x188d640, SoClass=SOGoMailFolder)"

IMHO, must be show acls and rights for superuser and not show acls for ordinary user with friendly message "Access denied"