Mecanim - 4.3 deltaPosition Bug

I’ve been using three layers in my overall Animator Controllers in older versions.

But when I checked via OnAnimator callback in Unity 4.3,

Only base layer’s root motion works.

And the others’ deltaPosition is always Vector3.zero.

I was using generic rig and this problem occurs even I made a brand new controller with same animation.

Is there anyone who knows about this issue?

Or is this certainly a bug?(Which is critical to me QQ)

Turns out that if you add a full-body layer mask then root motion will be applied properly on override layers. This wasn’t necessary in 4.2 but is in 4.3.