Problem with Realtime GI and multi-scenes in build

Realtime GI used with scenes loaded additively works in editor but doesn't work in build (Unity 2018.3.0b12). I made a sample project where three scenes are loaded from a script:

1. "Main" scene that contains only the camera. This scene is loaded first in sync. `Single` mode.
2. "Geometry" scene that contains a cube marked as `Lightmap Static`. Loaded sync. additively.
3. "Lighting" scene that contains a plane marked as `Lightmap Static` and emissive material on it set to `Realtime`. Loaded sync. additively.

Lighting settings:



Build Settings:



There's a `Loader` scene that has a button to load those scenes as described above.

Code (CSharp):

1. public class SceneLoader : MonoBehaviour
2. {
3.     public string Main;
4.  
5.     public string Geometry;
6.  
7.     public string Lighting;
8.  
9.     private void Awake()
10.     {
11.         SceneManager.sceneLoaded += SceneManagerOnSceneLoaded;
12.  
13.         DontDestroyOnLoad(gameObject);
14.     }
15.  
16.     private void SceneManagerOnSceneLoaded(Scene scene, LoadSceneMode mode)
17.     {
18.         if (scene.name == "Main")
19.         {
20.             SceneManager.LoadScene(Geometry, LoadSceneMode.Additive);
21.             SceneManager.LoadScene(Lighting, LoadSceneMode.Additive);
22.         }
23.     }
24.  
25.     private void OnGUI()
26.     {
27.         if (GUILayout.Button("Load Main scene"))
28.         {
29.             LoadMainScene();
30.         }
31.     }
32.  
33.     public void LoadMainScene()
34.     {
35.         SceneManager.LoadScene(Main, LoadSceneMode.Single);
36.     }
37. }

Realtime GI was built from the `Main` scene (set as the active scene), where `Geometry` and `Lighting` were also loaded.

When entering Play mode and loading scenes from the `Loader` scene, GI works as expected.



After making a Windows build, GI in the player doesn't work.



I tested exact same assets and settings in Unity 2017 LTS and the Realtime GI works there as expected.
Test project: https://1drv.ms/u/s!ApyPqduXdyo-k5Ivp2IVK1RBvKDvfA

Reproduction steps:
- Open project in Unity 2018.3.0b12
- Build the project for Windows. `Loader` scene should be the first scene to load.
- Run the player. Press the "Load Main scene" button in the top-left corner
- See that the Realtime GI is not affecting the cube

 

Could you please submit a bug-report, including your test project, as described in this document:
https://unity3d.com/unity/beta/guide-to-beta-testing#tab-3

After you submitted the bug-report, you receive a confirmation email with a bug-report Case number. Please post this Case number here (in this forum thread) for Unity staff to pick up.

 

Case ticket number: 1108413