iPhone continually re-syncs custom lyrics for thousands of songs

Every time I sync my iPhone to my MacBook, approximately 18,000 of my 30,000 songs will re-run the “Syncing Lyrics” step, which significantly lengthens the time required to sync. This re-sync occurs with every sync, whether done via USB cable or over wifi, whether I have added songs or edited songs or have made no changes to my Music library. I do not have any Apple Music subscription/streaming/shopping services. All songs were imported manually into iTunes/Music over the last two decades. Why does this happen, can it be stopped?