[Q] Lenovo K3 Note - Stock ROM - Contacts won't sync with Google

Hello dear xda-developers!

I just received my Lenovo K3 Note and Flashed it back to the Stock Rom (VIBEUI_V2.5_1529_5_1063.1_ST_K50-TS after an Update) and installed Google Play store. After that I proceeded to install all the Google services and Apps I need.
Everything is working just fine except for the Contacts. When I open Contacts and go to the Account Settings, there is no Google Account. I cannot add a Google Account either, it only offers me WhatsApp.

If I go to Settings --> Accounts --> Google and select my Google Account, then I have the following Sync Options:
App Data, Calendar, Drive, Gmail, Google Fit data, People details
... but no Contacts :(

I've tried installing 3rd party Contact Apps and also deleting the app-data and cache of the "Contacts Manager" and "Contacts Storage" Apps, but all to no avail. VIBEUI just doesn't even give me the option of getting my Google Contacts.

Any Ideas? I'm really happy with the phone so far, but this needs to work :/

Thanks in advance for any help, but I really don't need workarounds, I know there are tons of ways to export/import contacts, but I use my Google Contacts on multiple devices and I need a way to keep them synced the way Google intended ;)

Cheers!