How to reproduce:
1. Create a new Unity project
2. In the project open the Game view window
3. In the Hierarchy window select Main Camera
4. In the Inspector window > Camera, select Clear Flags > Depth only OR Clear only
5. Observe the Game view

Expected result: The Game view is black
Actual result: Camera artifacts are seen in the Game view

Reproducible with: 2021.3.2f1, 2022.1.17f1
Not reproducible with: 2020.3.41f1, 2021.3.1f1, 2022.2.0b13, 2023.1.0a16

Reproduced on: macOS Monterey 12.3.1 (Apple M1 Max)
Not reproducible on: Win10, Win11

Notes:
- If the issue is not reproducible when Editor is maximized, try resizing it and the Game view should flicker with artifacts