In the latest versions of INDD (17.2.1) and AI (26.2.1) i find that the overprint settings have become unpredictable. I have just received feedback from a client, that the date on a flyer i designed for him is illegible. In the attached print-file the date actually is overprinting. In INDD though the element is not set to overprinting. I have had the same issue with another document this week in AI.