Something is causing an update of some posts’ post_modified date. How can I spot it?

Every now and then, I see an old post at the top of a list of posts sorted by post_modified, even if I didn’t modify anything (last time it happened I was even on holiday).

However, I can’t find out what could be the cause. As this happens on a live site with many plugins and I can’t replicate it at will, is there a way to log this kind of event with the process responsible for it?

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