Join session not loading persistent level for client

[Vernyvoda]

Hi all!)

Faced a problem with multiplayer.
I did create a level with a menu for creating a session and to join a session.

The session opens level which contains persistent levels. But when the client joined, is not loading persistent level.
On the right on the image, the host has a blue plane, on the left client without this plane

Maybe someone knows why this happening?

[Vernyvoda]

The problem is caused by world composition. And when to exclude it there is no such problem. Why the world composition does not generate a landscape when using the dedicated server I did not figure out yet.