How to reproduce:
1. Open the attached project
2. Open and play Bug scene
3. Expand Daifni and Doctor model till you see "Bip001 Pelvis" (Daifni>Bip001>Bip001 Pelvis)
4. Attempt to move on X, Y,Z axis both models separately while animations are playing
5. Notice that you are able to move Daifni, this model doesn't rewrite constant values which are animated.

Expected behavior: we shouldn't be able to move Daifni as it has constant keyframes just like Doctor model.

By Design: developers did an optimization in Mecanim that makes when the current value of a parameter/Transform is the same in each clip of animation controller and is the same as the value in the scene, it is not written back. According to them this is the approach that is used right now and not going to be changed at least at the moment.