In amplified worlds, the overwhelming amount of caves are flooded with water or lava. These flooded regions spreads across hundreds of Blocks. This is out of all proportion to the aquifer amount in normal worlds.

These seeds have been tested and have this problem:

1. -3891980651361231112
2. 9083890045848701485
3. -7148695361435753399
4. 603268476067695090
5. -2574681488988251838
6. 5500256051118304563

Some more details:

• There are still some regions in the world where the caves aren't widely flooded.
• Lush caves aren't flooded.
• Underground structures such as mineshafts or geodes aren't flooded as well.