Hardcore hearts lose all color when player is taking freeze damage

The bug

In hardcore mode, heath hearts lose all of their color when a player stands in powder snow and begins to take freeze damage.

Relates to MC-205043.

How to reproduce

1. Create a new hardcore world
2. Open to LAN with cheats enabled
3. Run the command /setblock ~ ~ ~ powder_snow
4. Wait a bit until you begin to take freeze damage