Walking, going up and down at the edge of powder snow triggers freezing effect, but doesn't slow you down

When walking, going up and down in powder snow, it slows you down, and triggers the freezing effect. However, when you walk, going up and down only partially inside the powder snow, you start freezing, but are not slowed down.

What I expected to happen was:

• Walking at the edge of the powder snow is the same as walking in the middle

What actually happened was:

• Walking at the edge of the powder snow makes you freeze, but does not slow you down

Steps to reproduce

1. Place powder snow
2. Do small steps to the inside of the powder snow until you're at the edge
3. Walk along the edge.

Notice that you start freezing, but you are not slowed down.