I noticed that the caves generate differently in 1.14 vs 1.13. I ran into an unusual formation while caving, I thought it was some error at first. I later regenerated the world in 1.12, 1.13 and 1.14 to check for this. To my surprise, this cave does not even generate in earlier versions of the game and in 1.14 the anomaly remains after a few times regenerating the world.

I ran into this while caving in another location and noticed that if the chunk has buried treasure, it will not generate caves below.

Here is a seed to help view it easier: -3745970657198777088

coordinates: -163 53.00 246

There are other examples in the world if you have time to track down treasure check and look below for caves.

Thank you for your time.