A piston retracting with no block on its face briefly shows a bounding box which extends to 0,0,0
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-25195.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
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Confirmed in Windows 10 1.2.8.0. The bounding box extension happens to the piston body, not to the piston head. The orientation of the piston does not matter.