Apple TV 4K movies will not play beyond 1080p on Mac Studio

All of my Apple movie purchases will not play beyond 1080p. I did try the streaming trick mentioned in other threads however it's still 1080p.

All up to date, setting for streaming is 4K, not downloaded, and certainly meeting the minimum requirements - Mac Studio M1 Ultra, currently running on an OLED monitor at 3840x2160 @120hz HDR-10 OLED over Thunderbolt 4. (Sadly just learned Mac can't output Dolby Digital, but converts to HDR-10)

The page for these movies are marked 4K, however playback from purchases shows a maximum of 1080p. And when starting from the search results, the quality options are grey'd out but it's apparent it is still 1080p SDR.

[Re-Titled By Moderator]