Theoretically I guess the 12V system could short circuit, just like any other vehicle. Except there can’t be any gasoline spilled for a short to ignite.

And modern Tesla vehicles, like the Cybertruck don’t use a standard car lead acid car battery (which would have 48Ah or so). Instead they use a 16v small lithium battery (which has only 6.9Ah). Further, this battery system has short protection built into it with an auto resetting breaker.

So this battery, with its significantly less energy stored, has less chance of fire from a short than a standard car battery.