So, I got bored.
Booted Minecraft. Created an old world. Exited the world. Turned on caves and cliffs, then exited again. Finally, I turned the world infinite. I actually find this cool... I'm just pointing it out and I don't want a fix tbh. I think that some cool survival bases could be built using this glitched terrain as a frame.
You can see a demonstration of this on a livestream I did, linked here: https://www.twitch.tv/videos/1106429140
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Thank you for your report!
We're tracking this issue in MCPE-122042, so this ticket is being resolved and linked 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 to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki