Build a Bot boosters available for previous levels

No not at all. It was Candy Crush Saga and their event, Build-a-Bot. The players did not realize that it was a flaw when they introduced it to the players. They were able to go back to older levels to play this event to build up free boosters. When the studio realized what they had done, they fixed it but then the players were all in an uproar that they couldn't go back to the lower levels. It turned out that the event was not intended to be used on older levels and that was explained in the community by the community manager on Friday. Nothing to do with CC Soda Saga at all.

Now we are both confusing the games. What I wrote above was for Saga. Saga has events showing but not the way the players expected. Soda has all the events missing and the Soda players are upset too.

@Elsa

So sorry about the confusion. My question is about Soda players having their events missing. As in Candy Crush, were they removed because they were originally given to the players inadvertently; i.e., as the result of a flaw introduced by the studio? It seems odd that both groups would be simultaneously upset about the removal or change of events that they were given due to studio errors.

No I don't believe the Soda quests were removed for any specific reason. Maybe it's because they are working on some new quests. Each game has their own studio. But the issues with both games are not the same at all. As we both wrote, Saga had the issue of a flaw in an event. Soda has the issue of no events available except for Mr. Toffee's Fair.