Overflowed health in tab list uses number of hearts but is labelled as "hp"

The bug

When a player's health goes over 42HP (21 hearts), the tab list displays the player's health in fractional hearts but says it is "hp"; e.g., 22 hearts of health (44HP) is displayed in the tab list as "22hp". This is confusing as "HP" refers to half-hearts of damage/health, not hearts.

How to reproduce

1. Open to LAN
2. Type /scoreboard objectives add health health
3. Type /scoreboard objectives setdisplay list health
4. Go into Survival
5. Type /effect give @s minecraft:absorption 30 5
6. Press tab
7. Type /effect give @s poison
8. Hold Tab and watch as your health goes down.