Shadow rendered through objects when Cast Shadows is disabled.

Steps to repro:
1. Open attached project.
2. Select the Cube game object.
3. In Mesh Renderer Component disable Cast shadow.

Actual Result:
Shadow passes through Cube game object when cast shadow is disabled.

Expected Result:
Shadow should not pass through Cube game object when cast shadow is disabled.

Reproducible in:
2019.1.0a5, 2018.3.0b6, 2018.3.0a11, 2018.2.8f1, 2018.2.0b13, 2018.2.0a1, 2018.1.0f2, 2017.4.12f1, 2017.1.4P2, Unity 5.6.5P2.

Environment:
Windows and Mac