Im not sure how long this has been going on for but there is an achievement where you have to throw the cannonball from a specific height to trigger an explosion to kill enemies that never used to down players but now the explosion is much bigger and downs players, It does not down bots.
The only reason i found out is because depending where the cannonball spawns you throw it down as soon as you can and it nearly wiped the game i was in because no one would expect that to happen.