In the big San Diego fires a few years ago, I talked to a kid helping us try to save a house, and he said that in his neighborhood the cars and propane tanks were blowing up when the fire took out his community, a day or two before.
An “exploding” 250 gallon propane tank would clear a city block.
Betcha the “kid” saw the cars and tank burn, maybe mightily, but explode, probably not. Gas tank in cars should not be able to contain the pressure up to a point of actual explosion. The “exploding car gas tanks we see on TV and in the movies is set off by C4 or dynamite to make a spectacular fireball.
Propane tanks have a safety pressure relief valve that would release to the atmosphere if it was engulfed in fire and make a heck of a flame jetting from the tank.
I’d have to see photos of ripped open propane tanks, not just burned tanks as is usual.