Built-In shaders don't have that property so unity spam error messages in console.
I made a local package and added the _MainTex property to the shader and the errors stopped.
If I understand correctly, these errors occur on materials whose Blend Mode is not Opaque
Built-In shaders don't have that property so unity spam error messages in console.![image](https://user-images.githubusercontent.com/60809468/223355735-5c54c323-bd57-40f9-ad89-fc5f4d3587bb.png)
I made a local package and added the _MainTex property to the shader and the errors stopped. If I understand correctly, these errors occur on materials whose Blend Mode is not Opaque