Save & Load before Win
Steps for reproducing the error:
1. Start the game 1x1 Skirmish.
2. Bring your army to the enemy's dungeon's core.
3. Lower the health of the dungeon's core to a critical level (a couple of thousand or hundreds of health points). We must choose the time so that in a few seconds we would have a victory.
4. Save the game.
5. Load the same save.
My army destroys the enemy's dungeon's core, but the game does not end.
Bug is present in the version of Steam and GoG Galaxy.