New change to chocolate box feature?

Hi cateyt. I have not played a chocolate box fish level in a while so I can't speak to whether or not the problem you're encountering would apply to me now too. BUT, I did participate in a discussion with others earlier this year where we determined that the secret to doing a fish challenge is to find a level where fish are already on the board to collect. While I'm sure there are other better levels, I found that Level 251 (relatively fast and moderately easy to complete on the first try) lets you collect 4 fish per game. Hope that a level such as that one works for you.