The CanEditUser check on the Edit link in the Member Card for Administators doesn't check if the User they're trying to enter is a Super Administrator.
I'm not sure if it's possible to check that, since it's defined in the config.php.
I'm not sure I'd classify this as a bug, as the 'Edit' link can still be used to view privileged info, even if you can't actually edit the super admin.
I'm not sure I'd classify this as a bug, as the 'Edit' link can still be used to view privileged info, even if you can't actually edit the super admin.