I'd never heard that before. It makes you wonder how often this happens and unlike this case people just keep quiet about it. There's infamous examples like Roar where half the set gets injured and Twilight Zone where 3 people died in a helicopter accident. No telling how many injuries and deaths occurred during Italio cinema's heyday in the 70s and 80s when the goal was to push the envelope more and more. HK cinema history is pretty crazy as well when it comes to this stuff, with not only human deaths but animals killed on purpose to make scenes more realistic. Calamity of Snakes is an extreme example.