When I add a new camera to the scene, the skybox is rendered, but when I add the CinemachineBrain component, it disappears immediately. On the scene the skybox is visible, in the Lightings/Envitonment/Skybox Material section the standard skybox is set. I solved the problem in a very strange way: I deleted all the cameras, then created a new one, started play mode and in the moment of the game assigned the component – after that everything worked.
But now I will not be able to show any screenshot with proof( When trying to repeat the bug, everything works correctly.
I have not found that someone also faced a similar bug, so I decided to write. Perhaps someone has an idea what this is related to?