I too am experiencing this issue. FWIW my music library's files (not the metadata but the tracks themselves) are stored on a poor man's NAS, aka OpenMediaVault running on an old laptop haha. I wonder if it's due to that, or related (I doubt it helps)
Anyway just adding my whine to the complaint pile
At this point though, after 15 years in iTunes hell, MusicBee could cut my legs off and it would still be a 5 star app for me.