I was making a datapack which backports 1.18's height changes to 1.17.1, and wanted to make oceans deeper. However, the terrain on the edge of oceans turned out to be VERY odd. This is probably caused by some sort of error with the depth calculation on the borders, because that's where it happened.
MC-236484
Setting biome depth parameters can sometimes cause terrain generation to go nuts
Resolved
Cannot Reproduce
0
Cannot reproduce anymore since the
depthandscalefields were removed in 21w37a, and replaced with terrain shaper. But in general "weird terrain when I set numbers to extreme values" is not a bug.