Are you aware that a car parked isn't at all the same scenario?
It is not like remodeling an RV is going to affect the gas tank. But it sure will make a difference to the battery usage. A gas tank doesn't age in the same way as a battery either, and we don't have as much experience with the kind of battery packs used in cars either (and they differ wildly between models).
Probably less rare than a fuel tank spontaneously exploding. Has an ICE car manufacturer ever recalled a vehicle and said don't park it inside until you get it recalled?
All the time. I've owned several cars which have had "don't park it inside" kind of recalls. All of them ICE cars. I've had a neighbor's house burn down because of a "don't park in your garage" issue that led to a recall; once again an ICE car not an EV.
Hehe, there was a fire in a parking garage next to an airport in Norway a few years ago which basically destroyed the garage and all cars inside. People were really quick to blame it on an EV igniting and raving about how EV's should be banned from parking garages and on and on for days until investigation showed the fire started in a diesel car.
(Granted, the many EV's in there made the fire much harder for fire fighters to put out)
Are you aware that battery igniting while car parked is exceedingly rare?