Reproduction steps:
1. Open the user's attached project
2. Open "Assets/Scenes/specular"
3. Create a new Material in the "Assets" folder
4. Set the material's Shader to "Standard (Specular Setup)"
5. Add a texture "brick1_specular" to the "Specular" field in the Inspector
6. Drag and drop the material asset on the "Cube" GameObject

Expected result: added texture can be seen on the GameObject
Actual result: no texture shows up on the GameObject

Reproducible with: 2021.2.0a20, 2021.2.3f1, 2022.1.0a14
Not reproducible with: 2019.4.32f1, 2020.3.22f1, 2021.1.28f1, 2021.2.0a19

Note:
- materials created in version 2021.2.0a19 and below continue to work as expected in 2021.2.0a20 and above