I have to add that I had choosen the option to sort by “creation date, modification date”, so I thought if the creation date of 2 photos is identical they will be sorted by modification date. It seems that f-stop could not determine the creation date of these photos, hence it sorted only by modification date.
I found this out when I changed the sort order to only “creation date” because then the newly tagged photos were shown at the end under “unknown date”.
So this issue is not a bug and can be closed.
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