I just tested it, it works fine. You have to do step 11 then 12 immediately after without pause. There are other methods of solving it, but there's a lot more block pushing or a different step that also requires timing. So, I figured if timing elements are unavoidable, I may as well give you a solution that has as few steps as possible and minimize block pushing so that you waste less time per attempt.
I personally don't like puzzles with timing elements in them, and I always try to post a solution that don't require timing. But the puzzle designers really like putting them in, so you can thank them for that