Unlit/Texture material shader is not rendered if added as a skybox in lightning settings

To reproduce:
1. Create a new project
2. Create a new material
3. Select the material and change the shader type to Unlit/Texture
4. Open Window > Rendering > Lighting and select Environment tab
5. Drag the created material to the Skybox Material input field

Expected: getting a warning that the material type is not supported but skybox IS rendered
Actual: getting a warning that the material type is not supported and the skybox is NOT rendered

Reproducible on:
2023.3.0b6

Not reproducible on:
2023.3.0b5

Tested on:
Mac Intel
Mac Silicon
Win10
Ubuntu 22.04
Ubuntu 20