Adding member using og_role_grant does not populate og_users_role table

When I add member using role using og_role_grant. It does not populate og_users_roles table because "$og_roles = og_roles($group_type, $bundle, $gid, FALSE, FALSE);" does not return member and non-member from og_role table (only returns custom role) as $include_all parameter is set to FALSE.

I wonder if there is there way to populate og_users_roles table for member as well adding a membership to group.