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
Create a new hardcore world
Open to LAN with cheats enabled
Run the command
/setblock ~ ~ ~ powder_snow
Wait a bit until you begin to take freeze damage
Linked issues
is duplicated by 7
2 more links
Data packs and UI category?