Since Beat Saber 1.6 you need to also install PlaylistLoaderPlugin
Download the latest version from the releases page
https://github.com/thisredone/beat-saber-playlist-maker/releases
- creates/modifies/removes playlists
- works with songs downloaded from any source
- can create playlist from all unplaylisted songs
- creates metadata if needed
- looks into SongCore folders.xml with Pack=0