Stuck on "Saving Music Library..." and some metadata lost
I recently transferred all my data from a MacBook Pro to a MacBook Air M2 and upgraded to Ventura. My Music Library file is where it has to be by default and my mp3 files (around 250'000!) are on a external SSD. All the links for records with "album artist" filled in are wrong: "iTunes" being the name the folder where the MP3 are copied on the SSD, if I have a record, say, from Neil Young, most files are in iTunes/Music/Neil Young/Album Name/01 Song Name as they should be EXCEPT if Album Artist is filled in (e.g. Artist is "Neil Young & Crazy Horse" and Album Artist is "Neil Young"). The info tells me this file is in iTunes/iTunes/Neil Young/Album Name/01 Song Name but the second iTunes folder does not exist and indeed the original file is still in iTunes/Music, etc...
I have tried all solutions I could find (including most if not all suggested by turingtest2,) to no avail. I ask Music to search for the files in the background and it does after a few hours, but when closing Music it is stuck on "Saving Music Library". Any idea how to solve this? Thanks in advance
MacBook Air