I searched
incategory:"Files with no machine-readable license" insource:/eview/ -FlickreviewR
on Commons, in an effort to find files in that category that have a review template in source wikitext.
This query returns some old files. By sorting by edit date, I found for example this:
https://commons.wikimedia.org/wiki/File:Korg_Electribe_MX_(EMX-1)_Valve_Force.jpg
It was in that category for less than a minute when it was uploaded in 2010! As soon as this edit https://commons.wikimedia.org/w/index.php?diff=43801464 in the same minute of its upload passed, it was already out of that category.
Yet it still shows up in my search query 10 years later!
The file has been edited more than 10 times over the decade, and was last edited in 2017, so your database should have been updated right?!
I dont know whether this kind of false positives is solely related to the incategory command or not. Please investigate.