stat.fallOneCm does not track entities properly.

What I expected to happen was...:
If mobs or players fall a certain distance the scoreboard should increase in real time (Like 100 per block)

What actually happened was...:
The scoreboard updates when a player touches the ground (OnGround:1b) but only if he takes damage (3,5 blocks or more).
It also doesn´t count if you are in creative.
Mobs aren´t counted at all.

Steps to Reproduce:
1. Setup a stat.fallOneCm scoreboard with -> /scoreboard objectives add Fallen stat.fallOneCm
2. To see what happens -> /scoreboard objectives setdisplay sidebar Fallen
3. Jump off somewhere or push a mob off a cliff.
4. See that mobs aren´t affected and a player score increases when he lands.