Irradiance volume on Eevee seem to only bake the emissive materials, it does not bake global illumination, is this the intended effect ?
For example the cube color does not project on other polygons, because the irradiance seems unable to compute lighting bounces.
https://ibb.co/HDct5Zc
Aslo the baked map does not look very good for baked AO or shadows it produces, is there some parameters to increase qulality to make it more acceptable ?