Bonus Chest Not Generated in Caves and Cliffs Experimental Mode

Summary:
Bonus Chest Not Generated in Caves and Cliffs Experimental Mode.
Steps to Reproduce:
1. Create a new Minecraft world.
2. Enable Bonus Chest generation.
3. Enable Caves and Cliffs Experimental Feature
Observed Results:
When the new world generates the bonus chest is not generated.
Expected Results:
The bonus chest should generate as normal.
Notes:
Bonus chests generate normally with any other Experimental Features enabled.