To reproduce:
1. Open the project attached by the user
2. Bake Lighting
3. Select "Directional light" game object
4. Change Color parameter
5. Observe that the only object affected is the one that is non-static
6. Lower Strength parameter of "Directional light"
7. Observe that static game objects are now also affected

Expected: Static objects are not affected by lighting when Strength parameter of lighting is changed
Actual: Static objects are affected by lighting when Strength parameter of lighting is changed

Reproducible on: 5.4.0p1, 5.4.0p2, 5.5.0a6
Not Reproducible on: 5.2.5f1, 5.3.6p2

NOTES: For example, setting the "Directional light" color parameter to red and lowering strength parameter to 0.5 static objects turn green.
Baking the Lighting fixes the issue, but changing the color of "Directional light" and setting Strength parameter to lower than 1 reproduces the issue again.