Reproduction steps:
1. Open new AR or VR Template Unity Project
2. Observe Scene View
3. In Editor Menu, press Window -> Layouts -> Default
4. Observe Scene View
5. In Editor Menu, press Tutorials -> Show Tutorials
6. Observe Scene View

Expected result: The Scene View renders in all three instances
Actual result: The Scene View doesn't render on initial project startup and after pressing "Show Tutorials"

Reproducible with: 2020.3.16f1, 2020.3.18f1, 2021.1.19f, 2021.1.20f1
Not reproducible with: 2019.4.30f1, 2020.3.15f2, 2021.1.18f1, 2021.2.0a1, 2021.2.0b10, 2022.1.0a7

Notes:
1. The error "RenderTexture.Create failed: width & height must be larger than 0" is sometimes thrown when manipulating Editor windows while the Scene View is broken.
2. Issue doesn't reproduce on Windows 10