I made a copy of my world in experimental mode of the caves and cliffs part 2 and wanted to see what was below layer 0 and then I found that the bedrock went through layer -1 to layer -66 in the copy of my world in experimental mode this happened to me on 1.17.10 on android my device is Huawei P20 Lite, I hope they solve the error.
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We're tracking this issue in MCPE-129533, so this ticket is being resolved and linked as a duplicate.
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