To reproduce:
1. Open attached project
2. Open "MainScene" scene
3. Open Lighting window
4. Select "Scene" tab in the Lighting window
5. Notice that "Sky color" under "Environment Lighting" is set to grey
6. Notice that in the Scene window sphere and cube on the top is blue

Expected behavior: the sphere and the cube should be grey on the top

Note: Ground color setting modifies the sky color in the scene view

Reproducible with: 5.3.0b2, 5.3.0f4, 5.4.0b6
Not reproducible with: 5.1.4p1, 5.2.3p3