Halo 4 Infection bug(Plz help)

I have heard that there was a bug on reach where if the lives were set to 1 and the flood got killed, round wouldn’t end. And that this was fixed in halo 4. That was the case for a while, now its freaking back, the flood runs out of lives, but the round never ends. How did they manage to screw up like that, unfixing a bug?! Plz help me and fix this bug. I would be most happy!