The Music been brought in iTunes store at playlist can't play

[RekiDunois]

The music been brought in iTunes store can add into the playlist and listen with the music come from apple music together in Apple's own app, but It seems when I play this kind of music It occurred ‘unknown error’.
Is there some limitation in MusicKit JS at this part? Or just a feature need to be add?
Other song come from in apple music was played just fine, so It might not a network problem.