Wrong album artwork displaying on iPhone 14 Pro

I have a very large library of several hundred albums ripped from my own CDs (no downloads) in the Music app library (is it still called iTunes??) on my iMac 24". All albums have the correct artwork. I keep about 175 albums from that library on my iPhone and, until I got my iPhone 14 Pro, all albums transferred from my iMac to iPhone with the correct artwork. But since I got the 14 Pro, EVERY new album that I try to transfer shows up with the wrong artwork on the iPhone. Not once have I been able to get a correct transfer, no matter how many times I delete and re-try. The albums that were already in my 13 Pro library did transfer to the 14 Pro with the correct artwork--I used the Quick Start method of direct transfer from my 13 Pro to the 14 Pro. But any addition to the library now with the correct artwork has been impossible. Please help! I called AppleCare and spent over an hour with a tech trying different things but nothing worked.