Songs on iPhone have artwork from a podcast

Starting a new thread from All my album art has turned into a random… - Apple Community

I’ve had this same problem with cds that I have ripped into Music. I made sure the songs had the correct artwork, sometimes adding it manually. When I copied them to my iPhone, more than half took the artwork from one podcast. Recently, that podcast changed its artwork and lo and behold, the songs on the iPhone now show the new artwork.

it sure seems that when the song moves to the iPhone, it’s metadata gets changed to the artwork from one podcast.