Not sure about the Rivian but the electric F-150 has 120v/240v outlets all over the place, so it's quite possible seemingly minor damage could lead to electrical fires.

That's one of the big problems with EVs is making them safe.

A normal gas car if it turns on and runs for a bit without catching fire you're probably fine, in an EV it might run fine for weeks before it spontaneously ignites in your garage.