Ranger usersync, user group mapping for user deletion is not syncing up, if only one user is present in the group

Steps to reproduce :-
Using unix as a source for syncing user and groups.
1. Add a new group and user.
2. Add user to the group.
3. wait for sync to happen.(check ranger UI, user should be part of group)
4. delete the user from group.
5. You will still be able to see user is present in the group(from ranger UI).