Thanks dude.
Got interesting this morning after a iphone delete of music app, and re-sync of 31K odd songs over night. Prior had kept the iphone music app and wiped out the sings on iphone and re-sync.
After music app delete, sync back phone, I lost most of my playlists like say 45/50 not including the defaults. Some playlists "lived". No rhyme or reason, one was very much older playlist. One was a newer playlist. Was thinking it was tied to my apple subscript date and playlist creation but that guess seems incorrect.
In one of the 2 playlists I was focused on the region error issue prior, one of these playlists 'lived' and only one song had error; prior many songs had the region message in this plist, quick delete the single song with error and re-add solved the issue.
So, I seemed to improve the situation in a single playlist from prior. At cost of wiping out almost all playlists. Hard say if issue of region error still exists inside a 31K song library since lost playlists where I was doing the testing and seeing error conditions.
Anyways, next step is to back up the Itunes folder have now, and restore from backup older Itunes folder to get access to playlists I want to keep (export them, swap out Itunes folder back). I will also screenshot my playlist songs. PAINFUL.
I have disabled all cloud syncing. The only sync is from my local windows machine to tethered iPhone. I will manually add Shazam'ed songs as want via Apple purchases, converting them from AAC to MP3 in future. Spotifiy it is over Apple Music, and Shazam then manually adding these songs.
Net net, Apple introduced a serious error for those of us (older?) folks with extensive MP3 song libraries in Itunes...when start using Apple Music my issue started. Coincidence? Hard say. I presume it is the case. But my upgrade to 16.x could have been the problem as around same time I upgraded and enabled Apple Music trial.
I will never use Apple Music ever again. I will never cloud sync my Itunes library. I do machine backups both files and volumes anyhow. May add DirSync Profolder backup to my backup story also.
As someone mentioned, Apple cares little about your private non Apple Music library in MP3 format....this has made me think the unthinkable, is Android my next phone choice? I could have gone Android in less time than this mess. And I am still not back to where was....
I am going to contact Apple support and ref the above case #, just to add my voice.
Shall report back on my restore Itunes folder approach for playlists....