Thanks for the tips. We used the exact same recipe and had the same thing happen at the 30 minute mark! However, we did bake it the full 35 and we were using the recommended pan. In that last five minutes of baking–it lost like an inch of height. I’d gotten the cutting boards out per your idea, but didn’t need to use them, as once I had it out of the oven it shrank back down to be level with the top of the pan. Still, was great to have a backup if that had not been the case. Thanks for documenting your experience!