InvalidAnnotation when loading scene from AssetBundle

Anytime we load scene from AssetBundle, APT logs as error `Error Unity SetCurrentAnnotation({ }) result is InvalidAnnotation`.
This is caused by Scene.sceneIndex returning -1
https://docs.unity3d.com/ScriptReference/SceneManagement.Scene-buildIndex.html

We fixed it for now by implementing custom annotation, but it's a bit annoying and it took us a lot of time searching for why is this happening.

Start by reproducing the error while loading a scene from an AssetBundle, then inspect how Scene.sceneIndex is used before SetCurrentAnnotation. Confirm the behavior against Unity's Scene-buildIndex documentation. Done means AssetBundle scenes no longer produce an InvalidAnnotation error without requiring custom annotation.

Written by the indexing model from the issue text.