58PUS8536 panel resolution stuck at 1080p - Philips, Sony, TCL Android TV

I have a new Philips 58PUS8536/12, running the latest firmware (001.001.233.026).
What I see is that it's resolution does not change to 2160P no matter the content I play:
- Netflix 4K HDR
- Youtube 2160P HDR
- Kodi 4K HDR (hitting Z key during playback shows the current resolution at [email protected])
- PC set resolution at [email protected], image displayed but still panel remains at 1080p.
While the content is being played back I run adb shell wm size and it returns "Physical size: 1920x1080".
Nor can I find in the TV settings (or Android settings) an option to change the resolution.
I see some older Philips TVs running Android where you can easily select the resolution in the settings.
What is going on here? Why is it not switching to UHD?

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Tried using YouTube Vanced instead of the original YT app?
https://forum.xda-developers.com/android/apps-games/app-youtube-vanced-edition-t3758757
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There are settings to ignore screen resolution in Vanced
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uigger said:
Hi, I installed SwitchRoot and docked it. But the Picture on my FullHD TV is very pixelated. Is it because the switch runs 720p in portable mode?
My TV reports the Resolution as 1920x1080 60hz.
Is there a way to force it display a sharp 1920x1080 image without pixelation when docked ?
Click to expand...
Click to collapse
I have the same issue, but you are clearly in the wrong device section.

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