When I place a stone button, I can jump on it. When I do this it functions as a block. However, I went into the PC edition to see whether it was a new feature and I wasn't able to jump onto the button. In the Windows 10 Edition it seems to happen in both creative and survival mode.
Hope this helps.
Duplicate of MCPE-18363 – If you have not, please use the search function in the future, to see if your bug has already been submitted.