Raw Image that uses a Material with a custom Shader is invisible in Canvas when "Screen Space - Overlay" is set and the Player is in "Windowed" mode

Reproduction steps:
1. Open the “IN-75441.zip” project
2. Build and Run the project

Expected results: A white rectangle fills the screen space
Actual results: No white rectangle is visible

Reproducible with: 2021.3.39f1, 2022.3.31f1, 2023.1.0b10, 6000.0.4f1
Not reproducible with: 2023.1.0b9

Reproducible on: macOS 14.4.1 (M1 Max)
Not reproducible on: macOS 13.5.2 (Intel)

Workaround:

• Maximize the window and the rectangle shows up. After entering Windowed mode it is still visible

Notes:

• Not reproducible in the Editor
• Not reproducible when “Render Mode” option of Canvas is set to “Screen Space - Camera”
• Not reproducible when “Fullscreen mode” option in the Player settings is set to “Fullscreen Window”