Contacts does not sync with iCloud. I am running a Mac Mini M1 on Golden Gate 27.2.
This has been happening for a while, where I have noticed a difference between my iPad and iPhone with my Mac. If I update contacts on either my iPhone or iPad the other changes, and checking iCloud that also updates, but my Mac does not.
(On my Mac) I Initially switched off sync, and back on, and all the contacts disappeared showing they are not on the Mac, but the none updated contacts came back, also tried disabling "accounts" in Contacts, no change. Repeated the above exercise but re-started the Mac inbeween disabling/enabling, no change.
Finally I renamed Addressbook, shut down, restarted, opened Contacts nothing, did not repopulate the new Addressbook. Waited, and eventually had to put the old book back. All other service are syncing fine!!