[MCPE-145010] Unexplored chunks under y0 generate with air instead of deepslate

In chunks where the bedrock is replaced with deepslate everything from y level 0 to -64 is air

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migrated 2021-10-17T06:34:54Z

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[Mod] OcelotOnesie 2021-10-21T17:42:54Z

Thank you for your report!
We're tracking this issue in MCPE-143851, so this ticket is being resolved and linked as a duplicate.

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