iCloud Library / Music Match sync issues

Hello -

I have a fairly large Apple Music library and have used Music Match since its introduction back in 2015. Just within the last few days, I have had a really unsettling bug crop up. I now have a significant number of my files that are now showing the "dotted cloud" icon indicating that it's waiting to be uploaded, can't be matched, is no longer available in the Apple Music catalog, or hasn't been released yet -- but way too many titles to have this happen to all at once. Some are full albums while some are just a few tracks of an album.

After trying all the basic techniques of logging off/on, updating the iCloud library, and turning off/on the sych library, I still have the same issue. Here is the kicker...

a) the files were all originally used with Music Match years ago and I never transferred them my new machines after the service started working as advertised. I have long upgraded my computers. I do still have a backup and replaced a small sample set to see if the service would re-synch. Nope. I can re-import but then it has both the new import file as well as the greyed-out version creating what is essentially a duplicate.

b) The interesting thing is that on the iPhone when I try to play one of these tracks, it displays the "this file is not available in your region" however when I look over at the Apple Music site for the same album it allows me to stream. It also has a download arrow to download the file (as it would normally if it were already in my library) but when I choose to download nothing happens. It seems to be in limbo. Not able to do anything unless I delete the old file reference (which I tried with success) and re-import.

Is this happening to anyone else? Or any other suggestions?

I "could" go down the route of replacing every missing album and/or file but this seems untenable with a library of 60k+ titles. I also curate my meta-data and have loved it over the years. I would hate to lose things like play counts, groupings, comments, genre, etc. Let alone the huge task of trying to rebuild.