Whatsapp contacts aren't appearing on suggested contacts section of share sheet

Simple as the title, when I share anything, I get specific contact suggestions through iMessage, Mail, etc. But not Whatsapp.

I've tried Enabling/Disabling the "Suggest when Sharing" toggle in Siri Settings, and delving into the Whatsapp specific "Learn from this app" toggle. I've also tried disabling Screen Lock in Whatsapp settings itself to no avail. It's still a feature because a number of my friends have it on their older/newer iPhone models.

Any help much appreciated.

Thanks.