In a superflat world, set my render distance to 22 (max) and saw a weird structure in the distance. When I went to it it was made of bedrock and grass blocks. When I press use it disappears. This also happens in my survival world. P.S I saw the bottom of a cactus.
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Thank you for your report!
We're actually already tracking this issue at MCPE-55092, so I will resolve and link this ticket as a duplicate.
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