When taking damage from freezing, the damage taken is not visualized by a brighter version of that heart, unless you use a resource pack that adds that texture (see pinned images)

What I expected to happen was...:
When you take freezing damage, you lose half a heart, and that heart blinks for a while with a brighter version of it.

What actually happened was...:
The heart does not blink, it just disappears.

Steps to Reproduce:
1. Step into powder snow
2. Wait until you start taking damage
3. Look at you health bar