Powder snow creates z-fights when connected to a fence and wall (from the inside)

Summary:

When the fence and wall connect to powder snow, z-fights take place inside it.

Steps to Reproduce:

1. Place powder snow two blocks high.
2. Place a wall and a fence next to it (so that they connect to the powder snow)
3. Enter powder snow.

Observed Results:

Z-fights take place inside powder snow.

Expected results:

Z-fights shouldn't take place inside powder snow.

Video:

2021-02-28 23-12-39.mp4