samba - Aug 2017 - winbind normalize names = Yes: issue or feature?

Hi all,

With Centos 7 and Samba 4.4.4.

I was using "winbind normalize names = Yes" and not all groups were
available on Linux side (through wbinfo --group-info or getent group).

The groups which weren't available where containing underscore(s).

Once "winbind normalize names = Yes" removed the groups reappeared.

Is it normal?

Cheers,

mathias