Help needed - Terrain not fully loading on scene change in build mode

[Yerkisk]

I've been trying to figure this one out for a while now, but I can't. I have a main scene that loads correctly in both editor and build mode, and a second scene which I load async and additive (nothing special up to that point). The second scene uses a different terrain (so different terrain data) but the same trees and stones prefabs (not sure if this has anything to do with what is happening).

In the editor, everything works fine. Here's the scene in editor :

But when I build the project, here's the result of the same scene :

The texture for the grass doesn't seem to show up, the trees are not spawning, the rocks are strangely spawning in the air at multiple places, etc. None of this happens in the editor, only in build mode, and only on the second scene. The first scene, even in build mode, shows the grass texture, the trees and the stones correctly placed.

Using :

 - Unity 2021.3.15f1

 - Gaia Pro 2021 3.3.5

 - Gena Pro 3.5.0

 - GTS 1.0.12

 

Considering that I'm using the same trees and stones in both scenes, and the same textures, I really fail to understand why the second scene is not loading correctly. Any help is greatly appreciated.

Thanks