When a BMX or Bike is on fire, CJ will catch fire as well, no matter how far away he is from the fire. It can also happen while you’re in a vehicle, which results in the vehicle catching fire and exploding. As far as I know, this bug is present on all platforms.
What amazes me is how so many people don’t know about this bug. I see speedrunners get confused about why they catch fire out of nowhere. I noticed it back when I first started playing this game back in 2006.