How can I make HomePod Alarm Autoplay after first song?

I've always picked one song to wake up to on my HomePod alarm. After that song played, Apple Music would always keep playing similar songs and it was nice. Recently something has changed and it no longer does this- it just plays the one song and silence. I haven't changed any settings, so perhaps it was in the HomePod os update. Does anyone know how I can get it to play random similar songs after? Thank you!