The Bug
Too much grass is placed by oceans and rivers along coastlines, sometimes enough to generate trees

Reproduce
Create a normal creative world in 21w43a with the seed: 5666451149799436100
Fly over to 5150 / 75 / -2215
Face north and look around for the tree generated on a grassy river that runs through a badlands biome

Expected Result
Oceans and rivers should not place an excessive amount of grass

Note
Is especially noticeable along desert and badlands shorelines