When powering a piston and pushing a block through the world border, the piston extends but the block remains, causing a glitch in the texture. After removing the power source, the piston has two heads while the block moves into the border.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-82010, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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The file i uploaded is quite a little too big, please click the attachments section