Texture turns black instead of blurry when trying to blur the Texture

How to reproduce:
1. Open the attached project “BlurBugF_12102“
2. Build And Run (File > Build And Run)
3. Click on the “Do Blur“ button

Expected result: Material is blurred
Actual result: Material turns black

Reproducible with: 12.1.7(2021.3.8f1), 13.1.8(2022.1.13f1), 14.0.3(2022.2.0b4), 15.0.0 (2023.1.0a4)
Can’t test: 10.9.0 (2020.3.37f1) (Errors in the Console)

Reproducible on: macOS (12.5), Windows 10 (19044.1826)

Note: Same issue when tested on a Windows 10 WebGL build