To reproduce this issue:

1. Import the attached package
2. Open the scene
3. It has a cube with animation
4. Animation has 3 keyframes for transform position. First 2 are (0,0,0), the last one is (2,0,0)
5. Press play
6. Notice cube is shifting to the left when animating between first 2 keyframes which are both (0,0,0)
7. This only happens when having third keyframe with different properties

It happens because the animation curves no longer
are linear/flat as default.