Hello Léonie,
Thank you for the explanation about Hidden People album. makes sense.
The album isn't hidden.
Using "Review more photos" (This didn't work earlier for some reason, for all People, now it works again)
I did the yes/no thing for a while... (only had to say 'no' because none of the photos offered had Linas in them)
Unfortunately, this didn't do the trick.
Photos must have detected the face somewhere on those photos but doesn't show where.
For example:
Two faces detected. The one on the left is correct. The second is still the same "ghost" (name: Linas)
If I select the first (left) face, the system shows me the face on the photo with a circle. If I select Linas (right), no circle. Linas is the ghost.
Now. I could locate manually the 7 pictures with this "ghost" in it using the People album corresponding to the person "Linas", and hit "This is not Linas". Now the smart album previously created shows 6 pictures instead of seven, as expected.
I'll do it only for one; I'd like to keep the others as examples. I want to find the reason for this.
However, this is a particular case where it's easy to determine the list of ghosts using a smart album (because Linas is shown on pictures taken when he wan't born yet). But impossible to know if there are more ghosts elsewhere in the database...
I would be grateful if I could find all such ghosts in the database.
I noticed this problem by pure accident. Maybe I'm not the only one to have the problem. Maybe it is a bug or a database issue.