The script on the main camera is not executed when loading it from another scene in Unity, how to fix it?

Question

Unity

On the main camera, in the scene, there is a script that generates a map, when I launch the scene from Unity itself, then everything is fine, but if I load this scene from another scene, then the script on the camera is not executed. (if you place it in the root of the scene, it is executed, but I need it to remain a child object)