Artwork is disappearing from Apple Music for MacOS (Monterey)

I have Apple Music for MacOS 1.2.5.7 on Monterey MacOS 12.6

For music files that I own (not Apple Music nor iTunes music purchases), my long-standing artwork is disappearing in little batches of, say, 150 to 200 files at a time. I fixed about 250 files last week, and this week, 173 more are suddenly missing art? I continue to have "Automatically Update Artwork for Imported Songs" turned OFF in Preferences. Yet, today, when I opened my library after power up, the lower left corner briefly showed the "Updating Artwork" text (not sure of the exact text)?

I've always had a Smart Playlist showing me the files with no Artwork. (see attached screen shot)

It seems funny and frustrating that the correct artwork for some of the missing songs listed appears in the upper left of the playlist screen (for John Hiatt's Bring the Family, in the attached, for example.) Obviously this correct artwork is being grabbed from one of the songs that hasn't lost it is artwork yet, meaning, it is from a file NOT listed below in the shown playlist. Mysterious.

(I'll guess, as Streaming is now the way of the world, owned files aren't a priority as expected. Life and tech moves on. Maybe it's time to move to another niche music system geared for owned files. It's been an amazing 20 years of iPods and iTunes. What a ride.)