Steps to repro:
1. Create new project and scene;
2. Add any object to the scene (i.e. 3D Object-Cube);
3. Observe how this object is rendered.

Expected result:
Blue'ish skybox tint is shown on the object's surface (see attached screenshot).

Actual result:
No skybox light is rendered on the object's surface.
Regression introduced in 2019.3.0.

Workaround is to generate lighting in the Lighting window.

Notes:
- Reproducible in Versions 2020.2.0a12, 2020.1.0b10, 2019.3.15f1;
- Not reproducible in Versions 2019.2.21f1, 2018.4.23f1;
- Reproducible on Windows and OSX;
- Reproducible only for the default procedural skybox; not reproducible when the ambient lighting is set as a color or gradient;
- Reproducible in the built-in RP, URP; not reproducible for the HDRI sky in HDRP.