This issue seems to be related to 4.15+ as 4.14 worked fine, I had this issue on my own project so i tested packing the shootout multiplayer example and it also has the same problem, after packaging the game then hosting a session then opening up another instance of the project and searching for a game it will return the found game with nil info so host name and player count will read 0 and your unable to join, but it works fine when running it from the editor thanks.
Hey OverRated_AU,
As we discussed on the other thread, I am closing this out as a duplicate of the following:
Please refer to that thread for updates regarding this issue.
Have a great day