Steps to repro:

1. Open the attached project and 'Light_Fall_Off_TestScene';
2. Wait until lighting bakes;
3. Press Play to enter play mode.

Expected result:
Both lights in the scene have the same light falloff and have the identical rendering.

Actual result:
Realtime and mixed light falloffs are different (see attached screenshot).

Notes:
- Reproducible in 2018.3.0a11, 2018.3.0a10;
- Reproducible on Windows 10;
- The issue is not reproducible when Baked GI is disabled;
- Could not test on previous versions, because no meshes are rendered after opening the project in them;
- Also reproducible in the Standalone Player.