Changing the sample rate in the animation window when linked with the sequence editor, doesn't reset keyframe and the animation doesn't play completely.

Steps To Reproduce:
1. Open the attached project and select the cube in the hierarchy.
2. In the timeline, double click on the animation track.
3. Change the samples from 60 to 5 in the animation window.
4. Hit play in the animation/timeline.

Actual Result:
The animation doesn't play completely as the keyframe is not set correctly.

Expected Result:
The Keyframe should set correctly and complete animation should play.

Reproducible On:
2018.3.0a5, 2018.3.0a2

Not Reproducible On:
2018.3.0a1

Environment:
Occurs only on Mac