LG G1 - odd behavior with proprietary driver in ubuntu 20.04

I have ubuntu 20.04 installed on my computer using the proprietary Nvidia driver for linux.

I’m having a couple of issues -

I’m using an LG G1 OLED TV as my main display, connected using a Displayport to HDMI cable.

1st issue.

In 1080p resolution the image does not fit inside the display so I have to move my mouse outside the boundaries of the display to be able to click in anything.

2nd issue.

4K resolution is not an option available in the nvidia-settings program, I don’t see an option to create a custom resolution.

3rd issue.

4K resolution is not an option in Windows 10 either.

any chance these issues can be fixed?

Most likely the converter cable is the issue.