1. Open the user attached project
2. Go to Window --> Timeline and open Timeline window (Should be open by default)
3. Select "ControlTrack" GameObject from Hierarchy
4. In Timeline Window, move the white slider on the Control Track, notice that the Cube position changes while doing that
5. Click on "Preview" button to disable "Preview mode"

Expected result: The cube should return to its initial state when disabling preview mode to its Control Track
Actual result: The cube does not revert to its initial state when disabling preview mode to its Control Track (is left in its previewed animation position)

Reproducible with - 2017.3.0b8, 2017.3.0a1, 2017.2.0p1, 2017.1.2p2, 2017.1.0b1

Note: Enabling Preview mode again, reverts the state of GameObject