Adding a few factors.
1- If lights are not out and you try to go, you receive a DT penalty, even though everyone has already started the race and you are the only one with lights ON. So, not only you can't start the race with the others, you are forced to waited in line while everyone is racing until your lights finally disappear.
2- No ghosting. When a driver is slow at the start of the race, he becomes a ghost exaclty because he was too slow to start. However, when you have the Lights ON BUG, your car don't become a ghost, so everyone behind you will smash on your car as you are still waiting for the lights to disappear.
3- Frequence is higher than I initially posted. I guess it is something around 15-20% of the cases. Closing and reopening the game doesn't seem to fix the issue.
