The new caves, the noise caves, dont generate cave air. They generate normal air. The lava that generates under y -53, only generates in place of cave air. This means that lava can generate weirdly if normal caves intersect with the noise caves low in the world.
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I added some screenshots to make it clearer
Asteraoth
Does MC-216736 describe your issue?
Yeah, altough in this bug report i add the cause of this issue, the noise caves that do not generate cave air, and lava only replaces cave air, not normal air.
Asteraoth
I'll add it to MC-216736, thanks.
Np
I see it is marked as duplicate, but the problem in this case is not the cave air, it is the weird lava generation