I deleted the contents of the Codecs folder, restarted PMS, upgraded the libraries to the new scanners. Still getting these flooding the logs:
MetadataAgentPostProcessor: failed to find agent for identifier com.plexapp.agents.themoviedb
MetadataAgentPostProcessor: failed to find agent for identifier tv.plex.agents.movie
Back to the old legacy scanners I go… and hopes that it doesn’t bork the DB.