I got very confused today.
I do have gi without lights.
to test if it is none of my settings i created a new project loaded the minimal_default map,
deleted everything except the geometry.
When i did this i expected a pure black screen what i get is that i can clearly see the chairs and the table receiving light information.
I also moved the meshes to get rid of potentially baked information.
I did need to add a ppv go to Rendering Features -> Global Illumination and there check Indirect Lighting Intensity and set it to 0, then i got rid of the light.
How is this possible that the meshes receive gi without any lights in the scene.
I tested it also by adding a light and set it to 0 intensity same thing happened.