Steps to repro:

1. Open the attached project and 'SampleScene' scene;
2. In the Lighting window press Generate Lighting button to bake scene's GI;
3. Enter Play mode;
4. Observe the rendered image and remember it;
5. Exit Play mode;
6. Build and run the scene to the standalone player;
7. Compare the rendering with the one obtained at step 3.

Expected result:
The rendering is the same.

Actual result:
The rendering in Editor and standalone player is different. In the Player the image is brighter (probably because of the additional Baked directional light). See attached screenshots.
Regression introduced in 2019.2.0a8.

Notes:
- Reproducible in 2019.3.0a12, 2019.2.2f1, 2019.2.0a13, 2019.2.0a10, 2019.2.0a9, 2019.2.0a8;
- Not reproducible in 2019.1.14f1 2019.2.0a1, 2019.2.0a7;
- Reproducible only when both Realtime and Baked GI are enabled;
- Reproducible only when the Ambient Mode is set to Realtime;