In this particular design, a ghost block/visual glitch can be seen at the position above the top piston for a few seconds until the block is fully pushed. This has happened multiple times. (I believe it is due to the observer.)
Steps to Reproduce:
Make this design (complete with the block)
Push the button.
Expected Result:
The piston pushes the block normally.
Actual Result:
The piston pushes the block, but a ghost block/visual glitch is visible.
Attachments
Comments 2
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We're tracking this issue in MCPE-163240, so this ticket is being resolved and linked as a duplicate.
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This is not related to the observer. This happens whenever you push a block quickly twice in a row. The animation for for moving blocks simply lasts too long.