To reproduce:

1. Open the project (shadow_bug.zip)
2. Open MainScene from the project
3. Enable Material Animation

Expected results: shadows computed from the side of the light
Actual results: shadows appear glitchy on the moving cubes

Reproducible with - 2017.4.9f1, 2018.1.9f1, 2018.2.5f1, 2018.3.0a9
Not tested with earlier versions because the feature was not yet introduced there

Notes:

- The 2 cubes share the same material. Cloning the material fixes the issue.
- The issue seems to depend on the relative position of the 2 cubes. Playing with the cubes positions can make the issue disappear.
- In the frame debugger, we can clearly see the depth map + shadow map pass are not in sync with vertex positions used in forward render pass; it looks like the time passed to the shader is not the same during the different jobs. This does not occur when deferred rendering is used.