Formula 1 content not appearing in Apple TV app Watchlist

The new Apple TV Formula 1 content that was added with OS 26.3, all platforms, does not seem to add episodes of the live content (or any content, but I'm only there for the live F1 sessions) to my Watchlist. There is a button for it and I can "Add to Watchlist (+)" and "Remove from Watchlist (-)" -- implying it is on the Watchlist -- via the ellipsis on the buttons in the web interface, and I can "Add (+)" and "(-)" on the button in the iOS app.

but when I go to my Watchlist on the homepage there's no F1 content. Other content is added there without issue.

At any rate, is there a different, F1-specific Watchlist, or is this just broken?