Hello,
Same issue, I've lost over 1/3 of album artwork from CD's I ripped into iTunes YEARS ago. Before I spend hundreds of hours replacing album artwork for library over 90 GB, can this be recovered from a Time Machine backup prior to Catalina? If so, please provide idiot proof instructions please. I've already tried "get album artwork" in iMusic a couple of times no success. Some of the artwork that did get loaded with iMusic isn't correct. Same album name but entirely different artist, extremely weird.
One other thing I noticed, on my MacBook Pro my iTunes (OS Mojave with all updates) was about 4 GB larger than my iMac iMusic OS Catalina. Did a quick search, all my movies, TV shows, Podcasts, were present. Is there a way to recover entire iTunes library into iMusic? Again, idiot proof instructions would help. I'm not sure what exactly was missing in that 4 GB. I can't image there would be 4 GB difference between the two app's alone.
Any assistance on this issue is much appreciated.