Well, sorta… But the “lethal obstruction” was a bullet.
The production called for a close-up scene of one of the villains handling his .44 Magnum gun and bullets. Normally, for such a scene, totally inert “dummy bullets” would used. However, the location (North Carolina) couldn’t easily find these fake bullets. So the prop guy (doubling as armorer) decided to make his own from live rounds (by emptying out the powder). But the projectile tip from one of these improvised bullets separated from its casing and got lodged in the barrel of the .44. Later, when a blank .44 round was fired, it propelled the intact tip with virtually the same deadly force as a real/live round.
So in a roundabout fashion, the tragedy on The Crow was due to the same violation of safety protocols that occurred on Rust. I.e., live rounds were brought onto both movie sets.