The "head" of the pistons has a similar behavior to entire blocks , as the picture shows , the current version ( 0.15.0 ) could put " blocks " that have " interaction " with the player ... I hope I have helped reporting this BUG... 🙂
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Thank you for your report! This issue was, however, submitted at an earlier time as MCPE-14519. You may add any information you find relevant in the comment section there.