Forza 7 was the only firstparty game running in native 4K on Xbox One X, during the E3 conference

[Errorist76]

SuperBott said:

Hiku said:

"Will run", it says. That's not the same as "was running".

Crackdown 3 Will Run In ‘True 4K’ With 30 FPS On Xbox One - Release date 7 November 2017

the game is not available yet, so what's your problem?

In case you didn't notice the term "true 4K" has long been confirmed to be MS marketing speech for "a 2160p framebuffer output, including native 4K, checkerboarded and dynamic resolution" (quoting MS's own website for that.

True 4K is not native 4K, it's just deceiving marketing sprech.