When you put a dirt block, and behind it, a piston, the dirt block gets buggy and the top part shows the wrong texture. (And since I can't put the video in attachments, I'm going to put the link of a yt video so you can see it: https://youtu.be/k18zdtExNNo)
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We're tracking this issue in MCPE-135279, so this ticket is being resolved and linked as a duplicate.
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