To reproduce:
1. Open attached Unity project "1821 The Rebellion.zip"
2. Open "sceneA" scene
3. Open Animator window set FakeWalkShootAnimation as the default one
4. Go into Play mode
5. In scene view, try to move the head bone

Expected result: all of the bones should move when interacted with
Actual result: some of the bones are impossible to move

Note: In Project folder, navigate to Assets --> MyAssets --> MainCharacter --> Sprites&Anima --> Animator and open FakeIdleAnimation through animation window. Removing boneHead : Rotation component fixes the bug. (see attached gif "bones.gif")

Reproduced on: 5.5.4p1, 5.6.2f1, 2017.1.0b10, 2017.2.0a4