Entering or loading my save at the Castle of Light automatically enters combat mode, but there are no enemies left alive so I can’t exit the map. I have a copy of my savegames here, it’s the last autosave that triggers it:
Background: I freed Lux slaves, took the lights, and traveled back to the Ark using the map without triggering the fight. I later traveled back to the Castle of Light, and initiated combat by mind controlling the tank at the gate. The tank was mind controlled for a couple of turns, but even after he turned red again he kept fighting with the other ghouls, until the fight was won. When he was the only enemy on the map, I triggered combat again by entering his aggro zone. The autosave is after killing the tank.