The issue is that lobby host sets custom session parameter to new value, lobby client receives update, but session settings store the initial value it received, without updating.
UE Version: 5.1.
The problem lies in the code of function CopyLobbyAttributes:
In 5.1 some ***** uses find or add for updating a value in a TMap, which will ofc update it it only if key is not present
In 5.2 it’s already Emplace
Do you know what’s fun here? If we see history of changes on that file, latest shared commit of 5.1 and 5.2 is Sep 16, 2022, Added methods to retrieve online session from LobbyId. What if we check later commits in 5.2, shouldn’t they mention that they fixed a serious issue about lobby data not being updated?
No, of course not.
Holding up to your high standards, Epic Games.
I’ve been spending several months trying to implement party system in the game without steam and using EOS with the horrifying code base they created, never working as it should. I’ve tried lobbies, sessions, online beacons with multiple architectures requiring engine code changes and causing ConnectionTimeouts all the way along, now I may be closer to my goal, but I’d not recommend anyone to take my path of suffering again and just use steam and never trust what epic games do