Client is unable to Server Travel with the host when Seamless Travel is disabled

Client is unable to Server Travel with the host when Seamless Travel is disabled.

Repro Rate: 3/3

Tested this in //UE4/Release-4.27 @ CL#18319896 and the client is able to join in, it is a regression.

1. Download the ShooterGame template project
2. Modify the [Platform]Engine.ini file located below

   • ShooterGame\Config\[platform]\[platform]Engine.ini

   • Uncomment/Add the following lines to the file

     [GameNetDriver PacketHandlerProfileConfig]
     +Components=OnlineSubsystemSteam.SteamAuthComponentModuleInterface
     
     [PendingNetDriver PacketHandlerProfileConfig]
     +Components=OnlineSubsystemSteam.SteamAuthComponentModuleInterface

1. Open the ShooterGame project
2. Right-Click in Content Browser, create a new Blueprint based on ShooterGame_FreeForAll
3. Open the newly created Gamemode BP
4. In Details, disable "Use Seamless Travel" (Located in Class Defaults if not visible by default)
5. Open Project Settings > Maps & Modes
6. Expand the "Advanced" section then the zero index of "Game Mode Class Aliases"
7. Assign your Gamemode BP to the "Game Mode" setting under Index[0].
8. Save & Package the project for your platform.
9. Open Steam and login an account
10. Host a Free for All game with LAN off.
11. Join the game on a different machine than the host with a different steam account then the host
12. As the host, open the console and type "ServerTravel Highrise"

Results: Host loads into the map, client gets stuck at the loading screen.
Expected: Host & Client loads into the Highrise map.

5.0.3 Steam initial handshake packet timeout

Server Travel doesn't Work when I packaged