When you are out of fuel in Lamborghini SC63 and running only on battery in the "limp home" mode, the combustion engine tries to ignite every time the car reaches 40km/h and obviously fails, causing the car to lose a lot of speed until accelerating back to 40km/h again and it repeats. I doubt that's how it's supposed to work.
I tested with and without pit limiter, with and without having a button bound to ignition, and in all cases it does the same. I only own the Lambo so I can not test the issue on other LMDh cars.
Steps to reproduce:
Start with 1 liter of fuel in tank and drive a lap