World composition problem

I have an outdoor scene which is really big, and I split it into levels, I want to use level streaming there. All those levels are in a layer with streaming distance activated.
I also have another level(indoors), for which I don’t want to load any other levels, however, I do want to load this level by streaming it(I don’t want to block the game with just “open level”, by streaming it i can show some loading animation). I put this into another world composition layer, which has streaming distance deactivated.

My question is: Why when I load that indoors level by streaming it, the other outdoors levels(from the OTHER layer), get loaded too? After all, this indoors level is all alone in its own layer, with distance streaming deactivated!