Bug
If at the level of y = 0 there is no bedrock, after the reconversion under this block there will be air (shown in the photo).
Reproduse
Create world on 1.17.1
Replace the lower block of bedrock
Go to 21w43a
In survival, this can happen if the structure touches the level y = 0
Linked issues
Attachments
Comments 3
Duplicate of MC-239845
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I think this is intentional.
From 21w43a release notes:
"In old chunks, if there is Bedrock at y=0, the column below will be filled with Deepslate"