Hello, I'm assuming the bug report in your message is from the PC where it is working, since the Xorg.0.log contains only HD monitor. Try adding contents of /etc/nvidia/nvidia-drm-outputclass.conf (installed by xserver-xorg-video-nvidia) into your Xorg.conf. For me, the issue was that libglx from xorg was loaded instead of the one by Nvidia, and this fixed it.
I think the xserver-xorg-video-nvidia is supposed to be adding those config lines automatically, but it is not.
