Bonus target for me is now 30246 and I have 30246 points but no bonus puzzle......I'm guessing that you have to get more than the target to get the bonus puzzle but then the taget wouldn't be 30246 but would have to be 30247!!!!!
This may be because of the fact that the bonus target isn't checked when timed bonus points are added
(so you could even be over your bonus target, and still not get a bonus puzzle).
As soon as you do a "regular" puzzle, the bonus puzzle should be there.
It's one of those things that's on the todo list..