Contacts created in WhatsApp won´t sync into Google

[Android Central Question]

Hi,
I'm using Xiaomi Redmi Note 4
When I create contacts with WhatsApp ("add contact" from inside WhatsApp, and not from the phone app), these contacts won't sync into google:
I can't see them in my contacts list in google (from a computer), and before a recent update, when searching for these contacts, they appeared under a headline saying they are "WhatsApp contacts. Not synced".
WhatsApp has permission to access my contacts.
Any ideas? I've been searching online for answers for days...
Thanks!!