Summary:

The hoodoos bottom in the eroded badlands biome creates a flat ceiling at the cave entrances/in caves.

Examples:

Seed: -189012883
Coordinates: 10866 42 10237
Coordinates: 1920 84 -3332
Coordinates: 1992 88 -3412
Coordinates: 1953 132 -3022

Steps to reproduce:

1. Create a world with the specified seed.
2. Visit the specified coordinates.
3. Examine the ceiling at the cave entrances.

Observed results:

The hoodoos (in the eroded badlands biome) have created flat ceilings at the entrances to the caves/in caves.

Expected results:

Unrealistic flat ceilings will not generate under hoodoos in the eroded badlands biome.

Image: