Reproduction steps:
1. Open the attached project "StrangeSky_5.0.1f1"
2. Open the scene "Main". In this scene you will see a cube.
3. Notice the dark blue spots/shadows on the cube.

Notes:
1. This issue was only reproducible with one cubemap, all the other ones that I've tried did not have this effect
2. This issue appeared when the Skybox/Cubemap shader received an "Exposure" slider (regression since: 5.0.0b14)
3. Only reproducible in Linear Color Space