When exploring in spectator mode, you can go down to around Y -60 and the new cave generation interferes largely with the bedrock. It is not affecting gameplay but it very aesthetically unappealing which kinda ruins the point of the update.
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Duplicates MC-214844
I added the .png extension to your photo😉
In my opinion, the cave with the bedrock exposed looks nice. Additionally, such terrain will be harder to travel