There are lots of problems with car lights. Some cars may have them on, some off, even at night. I had races where most of the grid had them off in the night.
Do they have cars that have headlights? Some cars in the game don’t have them.
Yes. Forza GT cars. Also, if the car was used by me it had the lights.
Check your advance settings. Is it on dynamic?
I’m on Xbox One S. This issue does’t happen too often though.