Reproduction steps:
1. Download project "Zenva 3D Platformer.zip" and open in Unity
2. Enter Play mode
3. Jump to pink ball with blue cube (this action will switch scenes)

Expected: switching from scene "Level 1" to scene "Level 2" does not affect lighting of the second scene
Actual: the second scene becomes darker

Reproduced on: 5.5.4p4; 5.6.3p2; 2017.1.1f1; 2017.2.0b9; 2017.3.0a6

Note:
Workaround is to uncheck "Auto Generate" box and generate lighting manually;
After building, game's lighting looks as expected.