Parity Issue: Ancient Debris spawning seems inconsistent with Bedrock Edition

In Bedrock Edition, Ancient Debris is more likely to be found between y-levels 8-17, but in Java Edition, it's seems to more likely generate between y-levels 12-17.

 

Source: https://www.youtube.com/watch?v=gGhDwYjPfQE (skip to 4:50)