Ancient debris doesn't generate like java edition

Ancient debris in bedrock distribution is uniform. It generate between Y=8 to Y=23.

However it in java distribution is triangle and it generate between Y=8 to Y=24.

Ancient_debris even don't have data-driven features in bedrock edition.

Note: Core::Random distribution as uniform.

Steps to Reproduce:

1. Create a new world and load thousand of chunks in Nether.
2. Count the distibution and the amount of ancient debris

Observed Results:
The distribution of ancient debris is uniform

Expected Results:

The ancient debris should triangle distribution like Java edition.