Yesterday i saw something going wrong with our dear zombies on 0.47
Zombies falls after hitting like there are dead, but they aren't.
They don't stand up and run after you again, nooo... they stay on the ground and glitch on in as the street would be Ice, the problem: They hit you without the animation of it. So you can't kill them, as you don't know where to hit? on the ground where he is, or maybe in the air, where is head should be?
Very difficult to survive if dead Zombies still kill you;-)