No Cave Generation

Introduction
In the latest Minecraft Beta 1.16.220.52.. There's no Cave Generation. All the caves entrance replaced with flat surfaces. Already trying different Worlds and Seeds, but none of them have any Cave Entrances (Cave Holes).

Problematic
Try to use this Seed : -1755544431
Teleport to this Coordinate : (109, 70, 658)
and see the difference between the cave generation from the previous beta and latest beta.
You can see the Preview from the attachment.

Step to Reproduce
1. Make a new world on the latest beta (1.16.220.52)
2. Go to mentioned Coordinate
3. Again, make a new world on previous beta (1.16.220.51)
4. Go to the same Coordinate
5. See the difference

Expected Result
The seed have the same Cave Generation

Actual Result
The seed have different cave generation from previous beta and the latest one.

**Footage : https://youtu.be/uwA-EsWfnIo
**Twitter Thread : https://twitter.com/craft_874/status/1373169856577605632