Eeh, just because something can happen doesn’t mean it will, if they were punctured somehow that allowed all the gas to escape at once sure, but we are talking about a literal slow burn, the initial hole will be smaller than the hole on the torch that itself is spraying gas(or not but it’s irrelevant) unless after it starts spraying a torch in your face you continue to burn it it will never get big enough to explode and even then the gas will probably all escape or at least depressurize by time you get through it.

I maintain that it wouldn’t set off a chain reaction Though, this isn’t a Movie.