Arrows OnGround tag is not set when on ground

As the title says, shooting an arrow and getting it's onground tag returns false even though its on the ground. 

To reproduce: 
Shoot some arrows, then run /execute as @e[type=arrow ] run data get entity @s OnGround, it will say 0b always.
Expected result:
It will show 1b when it is on the ground and 0b while it is in the air.