4.25 network emulation problem

Hello, everything worked fine in my project on the client and on the server until I upgraded my project from UE4.23 to UE4.25.
Now, I can only launch the client because of the changes in the multiplayer options of the editor of version 4.25.
The problem is that my player on the client lag (but not the server everything is fine), even if I disable emulation or if I set the min / max latency and packet loss to 0 …
So I am trying to understand how to solve this problem because it normally worked on UE4.23.

PS : I also checked my project files after the upgrade to 4.25 and corrected the errors.