(most) Album Art not displaying in Music app (Monterrey 12.3.1) after importing from iTunes library (Mojave)

Recently imported a 5 year old iTunes Library from a Mojave computer over to a new Mac studio on Monterrey 12.3.1. About 19,000 songs in, 2000+ albums. The import went almost flawless it seems, except most 'Album Art' is not displaying correctly (just get grey note square). The tracks still contain the artwork, when I play individual tracks, it DOES show the art in the Playing/Info box in the top middle, or in the MiniPlayer. (The tracks also show their art upon previewing in Finder). BUT If I go to Album view, or enable the Album Art view on the left in Songs view, or do Get Info on a track and go to Artwork tab, about 75% are missing. The current exception is that a majority of the older stuff that was imported (2000-2010 or so) seems to be more likely to work properly, and anything new that I import today with embedded art, also works fine. I understand maybe its not pulling out Album grouped art due to import limitations... but its really killing me that it does NOT show anything upon doing a track Get Info and then going to Artwork tab. Appreciate any tips or help or advice!

Here is an example with a track playing in iTunes, and being previewed in Pathfinder. You can see two places artwork is showing, and the places it is not.