When GI is disabled, it is expected that this warning is not displayed:
"Your current multi-scene setup has inconsistent Lighting settings which may lead to different lighting when loading scenes individually or in a different order! Consider homogenizing the following:"

In user's project, all the GI is disabled but when user enters play mode and additively loads a scene, the warning is still printed since realtime Environment Lighting data between the scenes conflict.

Steps for reproduction:
1) Download the project `2018.2_BugReport_MultiSceneSetupHasInconsistentLighting.zip`
2) Open the scene `MainMenu`
3) Enter play mode
4) Click on `Load Trainyard`
5) Observe the warning messages in the console

Notes:
- Regression introduced in 2018.2.0
- Changeset info is added below