How to reproduce:
1. Create a new empty project
2. Add multiple Game View window tabs and make them all visible at the same time
3. Resize one of the windows
Expected result: Nothing of note happens
Actual result: Other Game View windows start to show black spots
Reproducible with: 2021.3.2f1, 2021.3.6f1, 2022.1.8f1, 2022.2.0a19, 2023.1.0a3
Not reproducible with: 2020.3.36f1, 2021.3.1f1
Reproduced on: macOS Monterey 12.0.1
Note: The black spots and their location seems to be dependent on which Game View window is being resized, different layouts provide different results