Version: 2.80 rc2 (Linux 64)
How to reproduce:
- Inspect the file (a cube with one animated value)
- Change the interpolation type of the first keyframe to one of the "easing" methods (Sine, Quadratic, Cubic, etc.)
- Observe what happens to the normalization of the curve!
This is not the expected behavior. Neither of the two keyframe values have been changed, so the apparent Y-scale of the curve should not change either. It seems like some interpolation types break whatever function is used to normalize the curve. The behavior is difficult to predict though; for instance, the bug will not initially appear if the interpolation type of the last keyframe in the example is changed.