Enable GPU Instancing turning Sprites darker

Following Code Monkey’s tutorials on ECS and Job System…

I am having a problem that all my sprites are getting darker when checking “Enable GPU Instancing”. Code Monkey on his YouTube channel talks about it, and his solution is to select the material shader as: “Legacy Shaders > Transparent > Diffuse”.

The problem is that not even this option is working now. It worked for the first 3-4 scenes, but now all sprites are also getting darker.

Is there any final solution to this?

I managed to fix this by adding directional light into the scene