My blog's og:image isn't displaying in link cards

I’m not sure what’s happening here, and the issue only started three days ago, as shared blog posts earlier than that show the og:image image in link cards just fine.

If I test post over on, the og:image image displays in link cards just fine, still.

I thought maybe I’d switched to using Jetpack’s CDN for images three days ago, but (1) that wouldn’t explain why they still work on, and (2) I tried turning that off and posting to and it still didn’t show the og:image.

I’m out of ideas. Anyone else?

Adam got into it over there.