Steps To Reproduce:

1. Open the attached project
2. Select the cube in the hierarchy to view it in the timeline
3. Change the duration mode to' fixed length'.
4. Drag the blue marker to 120 and play the timeline
5. Change the duration mode back to 'Based on Clips' and play again

Expected Result: It should play till the length of the clip i.e till 60th frame

Observed Result: It plays to 120th frame

Reproducible On:
2019.3.0a2, 2019.2.0b2, 2018.3.0f2

Not Reproducible On:
2018.2.0b2

Environment:

Win and Mac