It is what the summary says... an absolutely abysmal amount of chunk errors. After updating the game, I decided to create a new world to explore the new world generation. At first, it was good, smooth hills and terrain generation overall. Then I saw an opening to an underground cave and, like what's above the Overworld, the new cave generation was breathtaking. But after flying underground a bit, I noticed something odd, a chunk error. At first I thought it was just an unloaded chunk so I flew nearer and discovered you can fall all the way below Bedrock
But that's not just it, when I decided to fly beneath it to see if there are more, I was not disappointed. It was, to put it simply, a mess. Fortunately, the chunk errors doesn't seem to break the world surface.