This is a completely visual issue, so it doesn't impact gameplay at all. However, it is something that took my attention.

Preview 1.19.80.20 added Cherry Groves for testing. However, the Grass Block seems to have a wierd comparison of the side and the top colors of the grass part of the block.

Steps to replicate

1. Create a new world (with Next Major Update experimental gameplay enabled on).
2. Locate and go to a Cherry Grove biome (if you already has a world already in it, you can also go to it so).
3. Look very closely to the Grass Block

What i observed was...:

The sides of the grass block look way less "greener" comparated to the top of it, giving a wierd transitioning between those parts.

What i expected was...:

Even if they don't look identical, they would have very similar colors, being the side one not "less green" than the top of the Grass Block.

Important note

As this comment below states, this issue is only about the inconsistent color of side overlay of grass blocks in the Cherry Grove, and is different about inconsistent side overlay of the grass at distinct biomes bordering.

It happens that the inconsistency starts in the entire Cherry Grove, nor in its borders with other biomes.