Nuk3town, in Black ops 3, at one point had three easter eggs. Either by shooting off the arms, the heads, or both of all robots in the map in under two minutes caused them to attack you, basically. Successfully activating said easter eggs caused a chime to signal it had been completed successfully.
I and a friend originally did one of these easter eggs when the game came out, however after attempting it recently, such as when the DLC was released on PC on March 3rd, 2016, the egg failed to activate.
Further attempts all yielded the same result; no egg activation. We've tried official map settings, single player, two players, a whole party. We haven't missed a single robot, and still the same result.
TL;DR: Did they patch/remove the easter egg from the map? I've read all the patch notes I can find, and not one references any sort of removal.