Nubia Z17s (NX595J) Google Contacts won't sync


I’ve installed for the first time this release on my nubia Z17s :

I’ve installed
Everything works fine (google Calendar, Gmail, Notes, Task etc.) but Google Contacts don’t synchronize … when I go to Settings / Accounts / Google and select “Sync Now” Contacts do not synchronize …

What’s wrong with my phone ?
BTW I’ve just flashed the release and didn’t root.

Thanks for your help.

EDIT : I’ve seen this post : Fixed synchronization problem for 7.x.x devices but permissions are granted for Contacts so I don’t know why it won’t sync … (calendar does !)