Destroy Session not working on Source Unreal Engine 4.22 (Oculus release)

I tried many different ways to destroy a multiplayer session. Creating and joining works fine but when a player/client wants to leave the session and calls "destroy session" it returns with "failure". The client leaves to the main menu but is still connected with the server and can't create or join another session. 



I'm calling it inside the GameInstance. Replicating also did not work so I left it at "not replicated".

Epic won't fix it: https://issues.unrealengine.com/issue/UE-38897

Is there a workaround for that?
@NinjaGaijin
Please help me! :)