How to reproduce:
1. Open the "SampleScene" Scene in the attached "Repro2125926,zip" Project
2. Click on the "Directional Light" GameObject
3. Open Timeline Window
4. Make sure Play range ends on the last frame of the Animation
5. Play the animation

Expected Behavior: The Animation loops
Actual Behavior: The Animation stops and the play head is stuck at the start of the animation

Note: The behavior of the Animation on the last frame is derived from the GameObject's Playable Director Component's Wrap Mode ("loop" loops the play range, "Hold" holds play head at the end of the play range, "None" puts the Play head at the start of animation)

Reproducible with: 2018.2.0b3, 2018.2.21f1, 2018.3.14f1, 2018.4.17f1, 2019.2.20f1, 2019.3.0f6, 2020.1.0a22
Not reproducible with: 2017.4.36f1, 2018.1.9f2, 2018.2.0b2