Reproduction steps:
1. Open the attached “IN-101574.zip” project
2. Open the “OutdoorsScene”
3. Enter Play mode
4. Observe the Quad material in the Game view
5. Press “T” on the keyboard
6. Repeat the 4th and 5th steps
7. Observe the Quad material

Expected result: The material remains white/not transparent
Actual result: The material turns transparent/gray

Reproducible with: 2022.1.0a1, 2022.3.62f1, 6000.0.48f1, 6000.1.3f1, 6000.2.0b1

Reproducible on: Windows 10 (User reported), Windows 11
Not reproducible on: no other environment tested

Notes:
- Pressing “T” switches between “Material 1” and “Shader 1” referenced on the “LoadObjectRuntime” GameObject, and switching back from “Shader 1” to “Material 1” produces the problematic behavior
- Could not reproduce with URP, only reproducible with HDRP
- Also reproducible in the Player