With iCloud Photo Library we now have synced people albums. How do the scans on different devices interact?
I recently got a new phone which initiated a new scan and messed up my carefully sorted and trained people album by merging several groups of people. In the end the situation was that bad that I had pictures with twice the same person on it. It seems that on certain pictures with 2 people, the phone sorted the first person as Alice and the MacBook sorted the second person as Alice and then they got merged and there were two Alices on one picture.
I reset all people data which initiated new scans on both iOS and macOS and I just started naming people and there are unwanted merges again.