When you step in the block space that a button is in, the game acts as if the button is a whole block and covers the screen with either the wood or stone texture, whichever is the texture of the button being used
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This issue is still here for me in build 2

This issue is still here for me in build 2
Thank you for your report! This issue was, however, submitted at an earlier time as MCPE-14544. You may add any information you find relevant in the comment section there.