I've been downloading photos of my adult sons to give them for Christmas. In the course of doing so, one of them has completely disappeared from the list of People, and is not now recognised as a person in any of the photos in which he appears.
This is a little upsetting as it represents 22 years of his life; over 1900 photos.
At the time, I was going through his photos, and edited the location for one of them. When I returned to the list, I noticed his name had disappeared from the Tags. Other names were still present. Back in the People view, his name is missing. Any picture I look at with him in it now has only the other people, so there is no way for me to tag him again.
Is this a recognised issue, and, more importantly, how can I fix it?