4K stream not playing on AppleTV App when the film clearly has a 4K option.

I have films in my Apple TV App which have 4K versions on the iTunes Store but when I stream these specific films they only stream in HD (1080p). I have redeemed films in HD in iTunes and Movies Anywhere and AppleTV does not stream the higher 4K resolution for some. I have plenty of other films which play 4K HDR content on my Sony TV and I have monitored the settings to prove when the 4K and HDR resolutions are playing. Why won't AppleTV simply upgrade these streams to the highest format possible when I own the HD version? These are the non-Disney films I have issues with:

Aquaman (2018)

Jurassic World: Fallen Kingdon

Apollo 13

Justice League

Ready Player One

Despicable Me 3

Fantastic Beasts: The Crimes of Grindlewald

Illumination Presents: Dr. Suess' The Grinch

X-Men: First Class

Other HD purchases have updated to 4K once their respective films was upgraded such as:

Jaws

Die Hard

Fast and Furious 6

Furious 7

Interstellar

Minions

Secret Life of Pets

Does this have something to do with what is purchased and what is redeemed through iTunes?