Summary:

Leaves enters inside the powder snow, causing the player to see the leaves standing inside the powder snow.

Steps to reproduce:

1. Place powder snow two blocks high.
2. Place the leaves next to the powder snow (so the sides are touching).
3. Go inside powder snow.
4. Look to the side where the leaves is.

Observed results:

The leaves will be visible from the inside.

Expected results:

The side should not go into powder snow.

Image: