How to reproduce:
1. Open the attached project
2. Open the 1.unity scene
3. Click the "Cube" object and open AnimationWindow
4. Move a red indicator and observe animation
5. It has 2 keyframes <0, 0, 0> to <330, 0, 0>, the transform doesn't directly move to target angle but jitter in the middle. This is expected
6. Open Curve in animation window
7. Notice that curve is straight line. Shouldn't it reflect the animation and firstly go to negative value and so on?