Cave generation (noise caves or flooded caves) goes through mountains and hills (Savanna Plateau in this case), creating a gap.
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Kevin Stevens, Is not intended the only thing we know is that is an accident, Confimed by Henrik Kniberg in twitter so this could be get fixed or not we are not sure
Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response.
Is this still an issue in the latest version? If yes, can you please add it to the affected versions (or mention it if you are not the reporter)?
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From what I could see, the problem has been resolved; unfortunately I don't have the opportunity to enter my previous worlds.
One small detail: flooded caves continue to generate random entries in terrains below Y = 65 or 60.
That’s not a bug, that’s just part of world generation, so you’re bug is technically Working As Intended.