How to reproduce:
1. Open user's attached project
2. Open "SampleScene" scene
3. Select "Cube" GameObject in the Hierarchy
4. Open Timeline window
5. Make sure Scene view is visible
6. Play the animation in Timeline
7. Enter Play Mode
8. Observe the Game view

Expected result: Cube Mesh color animates from green to red
Actual result: Cube Mesh color animates from black to red

Reproducible with: 1.0.0 (2019.1.0b8), 1.2.14 (2019.3.16f1), 1.3.3 (2020.1.0b12), 1.4.0-preview.6 (2020.2.0a13)
Not reproducible with: 2017.4.40f1, 2018.4.23f1, 2019.1.0a9
Could not test with: 2019.1.0a10 - 2019.1.0b7 (Due to issue of being unable to animate Mesh colors)

Notes:
- To reproduce the issue the animation clip should be placed in the second or third Timeline's Animation Track, but not the first one
- Added a video for reference, when an animation is related to Mesh color change and Transform change and it's placed in the second track of Timeline
- The setting "Remove Start Offset" in Timeline appears to only work on animations, which are placed in the first track but doesn't work when placed in the second track
- Regression is about where the color issue started, the issue with the Transform is reproducible on all Unity versions (from 2017.4 to 2020.2)