The bug is when you get stuck and get suffocated in sand you see an X-ray of the world for a brief moment.
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Not at all, you saw something anomalous and reported it. You don't need in-depth knowledge of the game mechanics to report something that looks strange, and that, after all, is what the bug tracker is for.
Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response.
Is this still an issue in the latest version? If yes, can you please add it to the affected versions (or mention it if you are not the reporter)?
This ticket will automatically reopen when you reply.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
For any account or purchasing related issues, please contact Minecraft Customer Support directly, as we cannot assist with those here at the bug tracker.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
A similar thing happens during the loading process when breaking into a very big cave and when respawning, where you see mobs, blobs of ore, etc. in what seems to be midair before the blocks which occlude your vision of them appear.
You can make it appear for less time by shortening your render distance under "settings>video".
This isn't exclusive to Minecraft - you'll find it on any game where a large amount of graphics data is loaded in a short time.