Lightning Settings in one scene affect other scenes.

Questions & Answers
1

I have some scenes.
Each scene has a separate Lightning Settings.
I changed the Environment / Skybox Material for Scene A.
When I transition from scene A to scene B, scene B looks different than before.
Objects in scene B appear black.
When I first view scene B, it looks like it used to.
Why does this happen?

2

I am not an expert but can something be affected by prefabs? I would check affected prefabs.
Also at the same time, I am a complete beginner.