I am using a oneplus 2.There is a bug with both the wooden as well as stone buttons as to when we go near it and the button is placed in level of the players face the screen shows as if it would show when inside of a block. I have uploaded a video showing the bug with stone button the same occurs with wooden button as well.
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Illidicia
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.