If a song can't read the song's filename (this happened with Kharl's FOE map) it'll have silence as the preview and use whatever the last song you picked before it as the music. Funnily enough, it ends as soon as the music does, even if the beatmap is still going on.
Double funnily enough, it still shows the characters themselves in Osu! perfectly fine, as well as loading the beatmap fine.
Double funnily enough, it still shows the characters themselves in Osu! perfectly fine, as well as loading the beatmap fine.