Steam Multiplayer [Open Level] Problem [4.24]

Hello! We try to integrate the Steam Multiplayer P2P function to our project. The Problem is that if we run the game in “Standalone Game” mode, the Host opens a lobby, joins the level and after few seconds the Host is back in the start level. We used the option “listen” to open the Level, but the open level node with the options “listen” is not working.

Here is our Code of the Blueprint: