When you are standing in front of a stone button (also might be w/ wooden) your perspective will be like your inside a stone block
And one more, do blocks where the redstone torch was placed don't give the block a signal?
Also I tried to make a 2x1 flush piston door but the lower pistons doesn't update because it is not detecting a signal.
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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.