I am trying to upgrade a Unity 3D project from 2018.2.21 to 2018.4.30. To upgrade I deleted the Library folder and used UnityHub to load the project with 2018.4.30. The project build and ran in the Unity editor fine. When I built the apk for Android it used to be 200mb but was now 4gb. The app contains a few 3D high res avatar models, and a few scenes which are loaded as streaming resources.

In the models changing the inspector setting "Legacy Blend Shape Normals" to true seemed to be the cause of the huge apk size, with that setting the apk in back to a normal size and I can run the apk on Android.

However the app loads and the scene loads, but the lighting on the avatars is very overexposed (too light), and the scene is not visible at all, just white.

Any idea what could cause this? We have upgrade other projects from 2018.2 to 2018.4 without these issues. Do I need to reexport the stream assets in 2018.4, or any idea what is going on?

When running in Unity the scene is fine, the avatars are still over exposed, but the scene is not white. On Android the scene is just white.

Here is a screen shot from Unity 2018.2,

Here is a screen shot from Unity 2018.4,

Here is a screen shot of Unity 2018.8 on Android,

Seems like some kind of lighting issue maybe, but I have tried comparing the 2 projects and reverting any changes, but does not fix it.