Problem: I lost my entire playlist in Imusic. Does anyone know how to restore it?

ASC user turingtest2 help document: Empty/corrupt iTunes library after upgrade/crash - https://discussions.apple.com/docs/DOC-6561

If you don't see your content after updating iTunes - https://support.apple.com/kb/HT203225

Thanx for the attempt to help. Although it did not solve the problem. In my case the playlist that disappeared in the last upgrade was all playlists with individual tracks that I have put there. I still have playlists in the cases where they consists of full albums that I have just made a playlist of in Music. And I can see some of the tracks missing in the "most played" list, so it seems the database has some kind of recollection of what I had in my playlists. But of course this does not make it easier to understand what went wrong in the upgrade. The status is the same on all my devices.

Anyone have any idea what to do?