The Podcasts app won't download or play any episodes of WTF with Marc Maron?

I'm getting some very strange behaviour from the Podcasts app. One subscription (*** with Marc Maron) will not download or play in the app. My other subscriptions are fine, and download/play normally. Whenever I try to download an episode of ***, I get a "Playback failed" error message.

Playing back episodes through ***'s own app work fine though.

Any idea why this might be happening?