[ntropy]

@ntropy your music data and use of MySQL/MariaDB has revealed a flaw in the import of song history data. I can reproduce the issue and will fix it, possibly with a backport to v18 (if we decide to do another point release). Thanks for reporting your experience and the necessary data.

That of course does not help you much in the short term. If you would still like to restore your playback history of counts and last played dates, and are prepared to get a little more hands on with the database, then I can guide you in the steps to do that possibly even provide an update script (since I have your data). But maybe it is no longer relevent for you and my time is better spent on the fix and other Kodi improvements that benefit everyone? Let me know.

I've been creating a new history so I don't think my old history would be relevant.  Good luck on the fix.