Object meshes are not displayed in scene view when shading mode is set to Wireframe with OpenGLES2 and OpenGLES3 Graphics APIs however it works fine with Direct3D11, Direct3D12, and OpenGLCore Graphics APIs, refer attached screenshots

Steps to repro:
1. Create a new project.
2. Download and import Standard Assets from Asset Store
3. Project Browser > Assets > SampleScenes > Scenes > Car > Open
4. Switch to Scene View
5. Scene View > Draw Mode > Wireframe

Actual Result:
Object meshes are not displayed in scene view when shading mode is set to Wireframe

Expected Result:
Object meshes are visible when shading mode is set to Wireframe with all graphics APIs

Reproducible on:
2020.1.0a12, 2019.3.0b10, 2019.2.6f1, 2019.1.11f1, 2018.3.0f2, 2017.1.5f1.

Environment:
This occurs only on Windows.