Hisense 55 A7GQ & Nvidia RGB full

[Sint]

Hello!
My Hisense 55 A7GQ TV (4K@60, IPS, QLED) is connected via HDMI to a PC with an Nvidia 5070 graphics card.
The TV is in Game Mode.
In the Nvidia panel, the native resolution is set to 4K x 2K, 3840 x 2160 at 60Hz (located in the Ultra HD, HD, SD section; the PC section only lists resolutions of 1280 x 1024 and below).

When using the YCbCr444 color format, the image displays correctly, pixel for pixel.
When switching the color format to RGB, the image displays incorrectly, either full or limited.
This is especially noticeable with colored fonts, thin lines, calibration images for gamma adjustments, etc.
The image also displays incorrectly with YCbCr444 when Game Mode is disabled.

Another problem is that the TV's color adjustment doesn't work with YCbCr444, but it does with RGB.
And this TV really needs it due to poor default color calibration.

When selecting a signal source, the TV displays 8bit | BT709 | 16:9| YUV444 or 8bit | BT709 | 16:9| RGB when changing to RGB.

I tried changing the resolution, refresh rate, creating a custom resolution, and changing the scaling settings – nothing changed.

I read many different posts about CRU, tried changing settings, and adding resolutions – in most cases, I got a black screen after restart64.
In cases where restart64 or rebooting the PC was successful, nothing changed.

Maybe someone has encountered a similar problem and can help (if that's even possible).
I took screenshots of all the default settings.