I am having an issue with the lighting too. I get the 'light source off screen so no global lighting for you' thing described above, but also my whole screen flickers like it has very low frame rate. This flickering is transient and I cannot cause or stop it but is bad enough to give a headache if I carried on. also I worry about damage to my monitor.
I am unsure what logs to post... but I have a 3080 and up-to date graphics drivers. using directx11