Reproduction steps:
1. Open the Project inside of "SkinnedMeshRenderer MaterialPropertyBlock Issues.zip"
2. Select the "Mesh" GameObject inside of the Scene "SceneWithMesh"
3. Inside the Inspector, change the value of "Color 2" parameter inside of "MaterialInstanceProperties" component

Expected: The outline of Mesh changes accordingly to the selected color inside of Scene View
Actual: The outline of Mesh does not change according to the selected color inside of Scene View

Reproduces on: 2018.3.11f1, 2019.1.0b9, 2019.2.0a10
Could not reproduce on pre-2018.3 due to rendering errors

Note:
- Simple Mesh Renderer works as intended