LPG cars need a sticker to warn emergency personnel to be careful and treat a damaged vehicle accordingly. With EVs and hybrids there is a high voltage danger that isn't present in a pure ICE car. How do you think you would feel if the jaws of life cut through a HV power cable and injured the rescuer and the victim?
I think you would feel much worse if they cut through a petrol line.
It can't once your air bags deploy the battery pack circuit breaker cuts of the power to the rest of the car.
If there is no heat or spark involved then cutting a petrol line is far less spectacular than short circuiting high current DC. It's a good idea to warn emergency services of an unfamiliar hazard in the event that safety mechanisms may not have worked.
One day BEVs will be that common that all emergency personal will have had training to deal with the specific dangers. In the mean time a sticker that says "Hey I'm different to an ICE" can't be bad.