Did you play D1? The pattern was they'd issue an update to fix an exploitable glitch or something that would cause errors to occur in the game. There used to be a cheese that made the final boss of the first raid easy to beat. They issued an update so you couldn't get Atheon to walk off a cliff by throwing grenades at his feet. It introduced errors into the raid that broke it. They patched it several times but Vault of Glass was never the same. This seems similar only more... widespread than they prefer to admit.