Dedicated server map loading

Server load all maps in current map folder?

For example, I create few maps (Map1 and Map2) in Content/Maps folder

In my package server map settings I set ServerMap to Content/Maps/Map1.Map1

And after starts, load Map1 and Map2 (and different map objects/settings) (in console: Map2 is flushing async loading)

If maps placed in different folders, everything is ok.

Why this happens? this is something strange, I think