https://youtu.be/ljATJvUo-eY is a link to the glitch in the most updated version that I know of and this may break adventure maps if not careful
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Cleaning up old tickets: This ticket has not been updated recently (~1 year+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines.
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Reopening as this is still occurring in the latest versions.
Thank you for your report!
However, this issue has been closed as Cannot Reproduce.
We were unable to reproduce the problem you are describing in the latest version.
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📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki

Now tracking this issue at MCPE-84023.
still not fixed in the 1.2.9 update with the fix the bug that changed positions when reloging