The tab list has the VERY cool feature of showing everyone's hearts and whenever they take damage and regen.
However, it wrongly assumes that any health above 20 is absorption / gold and any health below 20 is not absorption.

Reproduction:
0. (Turn natural regen off to see results better)
0.5. /scoreboard objectives add health health
0.75. /scoreboard objectives setdisplay list health
1. Injure yourself (/tp @p ~ ~7 ~). You should be around 8 hearts. The tab display shows 8 red hearts.
2. Eat a regular golden apple.
3. As you regen, compare health hud and tab list. The hud immediately shows 2 gold hearts and then refills the red hearts from 8 to 10.
The list incorrectly jumps directly to 10 RED hearts and then shows 2 gold hearts filling.
It would be great (and advantageous in pvp games) if it was distinguished which hearts were absorption and which were not (especially since it can be confusing because absorption hearts cannot be regenned)