A couple of months ago I finally made the jump from Mojave to Monterey on my 2017 27" iMac with 2TB fusion drive. Recently I happened to be looking at files in my iTunes Music folder, and I find not all files are visible there, even though the Music app says they exist.
For example, the Music app shows me 16 songs in the Who’s Next album, but the finder only shows me 9 files in /Users/Larry/Music/iTunes/iTunes Music/The Who/Who’s Next. In Music, if I do Get Info on one of the “missing” files, it shows me the correct location. And the track plays fine.
I was looking at a different album, which was also missing some files in the Finder, and I had Music’s Get Info window open for the first track in that album. As I pressed the > button to scroll through the tracks in Music, the missing tracks appeared in the Finder, one by one, as I continued to scroll. Really. However, I have been unable to duplicate that in other folders. [Update - I have been able to duplicate this with some folders, not others. And I have also found complete folders not visible in the Finder that appear when I select the folder in Music or when I do Get Info on the first track. I’ve also found an album for which the files are completely missing but are still listed in the Music app.]
I have force-restarted the Finder. I booted from Recovery and ran Disk First Aid, which found no problems. I checked my APFS backups (by Carbon Copy Cloner - I do not use Time Machine), which match my boot volume.
I have not noticed any other type of files that are missing, but of course I have gazillions of files and use/look at only a small subset.
What has happened to my files and how do I make them visible in the Finder?