Upgrading to Mac OS 10.15.7 has erased contacts out of my iCloud conacts book

After upgrading to Mac OS 10.15.7, two contacts who are on my "Favorites" list appear to have their contact records removed from iCloud -- my brother and my doctor office. The numbers continue to appera in the Favorates list (on my iphone), but since the contact records are gone now show their numbers instead of their names. I cannot locate the contact records in Contacts (app) on the mac, or in the Contacts app on the phone. I also cannot locate these records in the iCloud.com through access to my icloud account. they appear to just be vanished completely out of icloud, which is very concerning because I do not know what the scope or impact of this is.