Steps to reproduce:
1. Download attached project
2. From Toolbar open My custom Tools -> PreviewRenderUtility Test
3. In the newly opened window add a game object

Expected results: Game object is correctly rendered
Actual results: Game object is magenta color

Reproduced with: 2018.4.7f1, 2019.2.2f1, 2019.3.0a12
Reproduce with SRP (HDRP and LWRP) versions: 4.10.0, 6.9.1, 7.0.1

Note:
- Reproducible with HDRP and LWRP
- Not reproducible with Standard render pipeline (Default render pipeline)
- For workaround use PreviewRenderUtility.camera.Render()