Graphics.Blit does not work when destDephSlice is 1

To reproduce:
1. Open the user’s project
2. Switch to WebGL build
3. Build And Run

Expected result: Both squares are colorful
Actual result: One square is pink

Reproducible with: 2020.3.39f1, 2021.3.9f1, 2022.1.16f1, 2022.2.0b8, 2023.1.0a10

Reproduced on: Windows 10, macOS 12.5.1

Notes:

• Not reproducible in the Editor on Windows 10
• Reproducible in the Editor and in the Player on mac