The patch fixes a problem from 15.11.00 where delivery requests would somehow disappear from lists at the Resource Center. This happened when playing offline. As a result, this would prevent you from actually completing the quest. Obviously, that’s a pain.
This patch now restores the requests to your current list. This means that with this patch, these delivery requests should stay put and not disappear while you’re playing the game offline. The patch notes also issue a somewhat obvious but nonetheless important note regarding matchmaking,
“Matchmaking in Monster Hunter World: Iceborne requires players to have updated to the same version. Keep in mind that you can only match with other players who have the same update. You can verify the version number in the bottom-right corner of the title screen.”