Whether I send them an invite via GHL or they leave a Google review on their own without my request, their Google Business Profile (GBP/GMB) review comes into GHL as if it's from a new Contact.
1) this contact isn't real. they're not able to be found in the Contacts tab, only the Conversations tab. You cannot click into Contact Detail view from the Conversations tab, such as to assign them a name and then find them in Contacts to merge them with the existing/real contact record.
2)
Related request to keep track of which users DID leave a review (https://ideas.gohighlevel.com/reputation-management/p/track-who-left-a-review) but that's not possible if the GBP reviews come through as new contacts
GHL Support Ticket# 1268645 has video documentation.