Linked contacts (iCloud and Google) do not stay linked on macOS Contacts app
I have my macOS Contacts setup to include contacts from both Google and iCloud. My iCloud contacts are also synced with my iPhone. I have many duplicates and I have used the "Link Selected Cards" function to link the same contact between iCloud and Google. The problem is the cards will soon automatically unlink. I am not sure what triggers this but it happens very frequently. At a minimum, this happens when I edit the card. Is this supposed to happen? I believe it also happens spontaneously, maybe during a sync?
It seems like I am not the only one with this issue as I have seen other posts here that have not been resolved. Is this a known problem?
Contacts keep spontaneously unlinking - Apple Community
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iMac 21.5″, macOS 10.13