The bug/What's expected to happen:
A world generated in 1.17 using the caves in cliffs preview data pack do not extend below y=0 when loaded in 1.18
To reproduce:
Create a world in 1.17 using the caves and cliffs preview data pack
Remove the data pack and load the world in 1.18
Notice that previously generated chunks do not have bedrock moved from y=0 to y=-64, filled with caves and deepslate
Thank you for your report!
We're tracking this issue in MC-241179, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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