Player's hearts show the incorrect health the player has.

Steps to Reproduce:
 
1. (I used an elytra but dont know if works with other ways).
 
2. Get damaged.
 
 
Observed Results:
While using an elytra and hittong a wall, my hearts showed I was supposingly dead but I still was alive.
 
Expected Results:
If that hit actually had killed me, I should have died, otherwise, if that hit didnt kill me, the hearts should have appeared the correct whay they should.