samba - May 2017 - symlinks are invalid folders for windows 10 clients

Hi

to make folders followable for windows 10 clients, we have to enable both wide
links and allow insecure wide links
cifs clients on ubuntu doesn't need this parameters...
samba server: debian 9 / samba 4.5.8 as domain member
testparm -s -v | egrep 'extensions|links'
        allow insecure wide links = Yes
        unix extensions = Yes
        follow symlinks = Yes
        wide links = Yes

On a old samba server, both windows and ubuntu can follow symlinks with secure
configuration.
samba server : debian 6 / samba 3.6.6 as domain member
        unix extensions = Yes
        allow insecure wide links = No
        wide links = No
        follow symlinks = Yes


My symlinks are relative or absolute, but everytime inside the share.
What's the problem?

Best regards, 

Sébastien QUESSON

hi

can someone reproduce my problem?
these settings are really dangerous and I'd like to enforce security back...