Debian 12, 525.147.05 drivers, no files under /dev

Since it’s an issue with the vbios, there’s a very slim chance this can be fixed with a reflash. To check you would need to use nouveau to debug:
https://forums.developer.nvidia.com/t/nvidia-geforce-gtx-1650-no-external-monitor-not-detected-in-xrandr-opensuse-leap-15-3/215296/19