here is what it looks like in the editor | Official Unity Discord | Page 1

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This is a lighting problem because lighliting is still calculating in the background. This will likely occur in the Editor only. This should not happen in the build.

Depending on your Unity version, you can fix this by going to Windows --> Lighting --> Settings then go to the Scene tab. Scroll down and disable Auto Generate checkbox then click the Generate Lightning button.

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probably in both scenes

#here is what it looks like in the editor