*Steps to reproduce:*
# Download and open the attached project ([^SpriteRendererBug-URP.zip])
# Open the SampleScene
# Select the Sprite Renderer GameObject

*Expected result:*
* No error is shown in the Sprite Renderer component when using URP shaders

*Actual result:*
* An error is show when using URP shaders in the Sprite Renderer (see attached screenshot)

*Notes:*
* Reproduces in all public Unity builds
* Reproduces in URP only; other RPs are unaffected
* URP shaders use _BaseMap property for albedo textures instead of _MainTex. Perhaps it would make sense to store _MainTex in URP shaders as well, but hide it in the inspector