This is likely a bug caused by saving a new game from the previous build 3013. The issue caused the goblin campaign’s node name to be set incorrectly in the game, which makes it unable to set the campaign to complete.
This is fixed on develop-3023 (for new games and save games started on builds without that bug) but not for saves where the game was started on the build that set the node names incorrectly.
You can see my post here for ways to resolve problems starting the orc war on your save Campaign ending bug