How to reproduce:
1. Open the attached project's Scene labeled "SampleScene"
2. In the Hierarchy, select the "Character"
3. Open a Timeline Window (Window->Sequencing->Timeline)
4. Play the Timeline track with "Character" selected
5. In the Game View, observe the Animation
6. Enter the Play Mode
7. Observe the Timeline's Animation again

Expected result: Animation with an Override Track is played the same in and outside the Play Mode
Actual result: Animation with an Override Track is not played correctly outside the Play Mode

Reproducible with: 2019.3.14f1, 2020.1.0b10, 2020.2.0a12
Couldn't test with: 2017.4.40f1, 2018.4.23f1 (Override Track is not available)