I already update to Nothing OS 2.5.2, HDR display function enabled in Display, Youtube version 19.03.35 ( updated on Jan 19, 2024 ).
Still not display correctly yet in Youtube app.
In Youtube app you can see HDR option but the color is very dark. Every time you start to play the HDR videos you would see the screen suddenly become darker.
When you use browser app like chrome to watch, because no HDR function support in browser app, the color at least is normal (brighter than Youtube app).
Still don’t know what happened.