A panel can span multiple pages but cannot contain buttons on multiple pages.
Controls Other/Unlisted Maker
Sorry to respond so late. I find that I can place a button across 2 pages, but panels cannot span multiple pages and contain buttons on both pages. To minimize the impact I create adjacent panels on each page to contain the buttons on that page. However a button that is split on two pages is not contained in either panel. Not sure if this what happened to you.