samba - Jun 2016 - winbind supplementary group issues on Solaris

Hello.
After updating to samba 4.2.x (or later) I see the following issue on 
OpenIndiana: winbindd can't fetch group members when asked about 
"--group-info" and nss doesn't see user's supplementary groups
-
https://bugzilla.samba.org/show_bug.cgi?id=11951 . Any ideas how to 
debug it further?
-- 
Best regards,
Alexander Pyhalov,
system administrator of Southern Federal University IT department