Does one of you know whats the difference between Camera HDRI and World HDRI

Blender 2.8 now have these options to import Viewport HDRIs

I've noticed that if i import a file (either .hdr, .exr, .png, and .jpg) as "camera HDRI", it only is shown as a Studio Light on Solid Mode

While importing as "world HDRI" it works both in Solid Mode's StudioLight and LookDev (Material) Mode

So... What's the purpose of have those two ways to import HDRs? Is it a bug, that, being each import mode work only for one Lighting type, make "World HDRI" work for Solid mode too?