YouTube playlist feed only shows first five episodes

I just tried subscribing to a YouTube playlist (THIS WEEK AT THE ONYX) but only the first five episodes show up. There’s a post from earlier this year that says YouTube playlists are supported. Is there something wrong with this playlist or with my feed URL?

Probably what’s happening is the API is only providing 5 recent videos. Future videos will come in just fine though.

Thanks. I’ll keep an eye on it.