This glitch randomly occurs to me when building in creative mode. I have a link to a YouTube Video so you can see it visually. I had an an app recording in case it happened, and it did. https://youtu.be/5dc60sm-fJ0
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Thank you for your report!
However, this issue is a Duplicate of MCPE-16688.
If you have additional information, please add it to that report.
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