How to solve the light problem in Unity?

Question

Game development

After switching to version 2020.3.4f1, there was a problem with the light in my project:
I created a scene, the first thing that caught my eye was the lighting, which became stronger than it should:


But if you load the scene through SceneManager.LoadScene, the lighting will become normal:


You can Can I fix this, or do I need to downgrade to a previous version of Unity?

Answer 1

I installed the old version, the problem disappeared ...
But still, what is it?