Anyone else's Xbox One X losing image while outputting in 4K?

It is 4k upscaled but not native 4k. The main difference being that the Xbox One S takes a 1080p(or lower) image and upscales the resolution to appear in 4k while the Xbox One X is capable of playing some games directly in 4k resolution. Upscaled 4k is has
a sharper image that 1080p but is still a little less detailed that native 4k.

So yes, while you are seeing a 4k image when possible, it is not true 4k.

The Xbox One X simply isn't powerful enough to output pretty much any game at 120Hz, the console will be sending out a 120Hz image, but that doesn't mean that the game will be running at 120Hz.

Its like setting your console to 1080p but displaying on a 4K TV, the TV still shows a 4K image, but that's because the image has been up-scaled to fill the 4K screen.

Yes, the 360 can output up to 1080p, but not 4k. For 4k you will need a Xbox One S or Xbox One X.

you need hdr for 4k output

I don't think you fully understand

Uhd and hdr are required for 4k output

Unless you have an xbox one s not a x

You can't play in 4k

4k is only for.movies or streaming sources which require both uhd and hdr

But.xbox.one x will do 4k gaming

The only way to view your Xbox One at 4K UHD: Is to connect Xbox One HDMI Output to an A/V Home Theatre Receiver capable of upscaling 1080p output via HDMI to 4K UHD for UHD television.

Note: You will potentially see visual artefacts and/or image tearing by upscaling 1080p to 4K UHD.