Fall damage is getting calculated by levetation potion effect and killing player even with jump boost and/or feather falling
Even If you have armor with feather falling or jumpboost potion effect on once you run out of the levetaion potion effect all fall damage is calculated and the ff or jb is negated
Unable to reproduce. Ran command
Damage was 3 hearts with diamond boots, 1.5 hearts with diamond boots with Feather Falling IV.