Hi, this is world generation bug, which generates floating walls of some blocks.
All these pictures are from just one world.
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[Mod] OcelotOnesie
Thank you for your report!
However, this issue is a Duplicate of MCPE-55092.
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.
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