Apple TV display scaling bug

I am using Zwift on an Apple TV 4K, running at 1366x768. The app is scaled wrongly, only using the lower right 2/3rds of the screen.

Seems to be a know issue: https://support.zwift.com/hc/en-us/community/posts/115011636106-Apple-TV-4K-no-fullscreen-

 

Thanks - I missed that. The image in the referenced thread is exactly what I am experiencing.