Does a dedicated server load and simulate all world tiles of a streamed world?

My world is split into various tiles and streamed in and out using the world browser system. On the server, are all tiles loaded at the same time and simulated, or only sections of where the player is? How is this handled on the server side? What kind of behavior should I expect?

Thanks for any insights

The tile functionality of the world browser does not currently work in a networked setup. Tiles work by teleporting players around, and this functionality is not setup for true multiplayer

Do you have any suggestions for creating big multiplayer worlds?