I have been working to resolve what happened and how to get them back for the past two days.
It's likely a red herring and not related to this Catalina Album Artwork thread so I don't want to take us off-track, but just-in-case: After completing the initial migration to the new Music App, I have 123 tracks (of my ~28K) that have "missing files". It might be useful for others having problems to try and be a bit more specific if they can.
For album art not showing up, if you have a metadata tag editor (I use Metadatics amongst others), have you looked at the source track to determine if it has imbedded album art and if so, what are it's characteristics? If it does not show up in the metadata, what is your iTunes/Music preferences setting to bring in new album art from the cloud?
You have a different type or combination of artwork that is/is not imbedded in track meta, along with perhaps a different album art preferences setting that influences this. Eventually all my tracks have album art displaying in the Music App interface once again. It took more than 12 hours for my 28K tracks to be read and process on a 3.6GHz 8-core i9 iMac with Thunderbolt 3 connectivity to my Drobo where the 500GB of music data is located. May not be waiting for the process to complete. I still suspect people having problems with this: I found with legacy iTunes it would unexpectedly replace my album art with Apple's version - which is not what I want to happen I only want Apple's Art to be used if my metadata for some reason does not include it. I keep the Preferences Setting to use Apple's Album Art OFF. (Apple Music expires later this week - at least for now.) I have both iTunes Match and Apple Music enabled with the Music App. Perhaps 85% my 28K tracks are M4A Apple Lossless (manually ripped from my CD collection, with hand curated meta including album art), nearly all the rest are 256K AAC from the iTunes Store, with a couple handfuls of miscellaneous others. Size varies up to perhaps 1500x1500 or more in some cases, but it's all over the map. I know that nearly every one of my 28K tracks have embedded metadata with JPG or PNG album art as the single Front Cover within the ID3 album art tag. I don't forgive Apple with migration issues anyone is having, but in an effort to help others here, there are a lot of variables that may be the culprit, so in case others want to compare, here's my situation that seemingly made it through the album artwork migration process: user/Music/Music or equivalent) or where your actual media folder is located. I have yet to find where Music is placing this data as it's not in the same folder with the apparent new Music index file (e.g. 
(The new) Music App appears to be rebuilding an equivalent "Album Artwork subfolder" like we've known forever with iTunes, by re-reading metadata from each track, then depending on Preferences Setting, downloading missing album artwork that it has in Apple Music or the iTunes Store in the cloud. I know the feeling, as I went through this a few years back with legacy iTunes as I was trying to meticulously clean up metadata in my iTunes music library - at the time, I had months of problems with iTunes replacing my carefully curated album art, that were compounded by the original iTunes Match process, which Apple Support wasn't able to completely resolve, but I finally figured-out. Sorry to hear others are having problems with album art.
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