Reproduction steps:

1. Open "MinimalRepro.zip" project
2. Open "Test" Scene
3. Enter Play mode and run around
4. See that the characters head follows the player
5. Exit Play mode
6. Add "...zombie_attack_1", "..zombie_walk_80" or "...zombie_walk_100" Animations to the "oma animator" Animator Controller
7. Enter Play mode

Expected Result: The characters head still follows the player
Actual Result: The character isn't affected by the script that should rotate its head towards the player

Reproduced with: 2017.3.0a4, 2017.2.0b7, 2017.1.0p3, 5.6.3f1