per instance Ldap-Group attribute does not work

[Oleg Palij]

> 
> I'm switching from 2.2.5 to 3.0.12. Users are in Active Directory.
> I found that per instance Ldap-Group attribute does not work.

Got it to work with:
 if !(&ldapdomain1-Ldap-Group == 'vpdn') {

Is it expected behavior?

In freeradius2 it works without &. And default LDAP-Group works without &.
I can't find info about this change in switching guide as well as in ldap module documentation.