I may have hit a bug then.
My timeline (the left side of the Events tab) was not linear 2025>2001. Instead, it went 2025>2001 then back to 2025>2001 and one last time 2025>some intermediate year. I should have taken a screenshot but I thought that it was as intended, in the order of scanning.
Similarly, in the People tab, the order for each people was also this mostly-by-date order but going back to recent pics a couple of times.
Tonfotos had been working for several days non-stop and I had confirmes a few 10s of 1000s of people.
Now, I rebooted my machine yesterday, and, restarting tonfotos, the timeline seems perfectly in date order. Somehow, it heled itself. If it happens again, I’ll be happy to take some screenshots or help debug any issue.