Did you try and import a character from an actual copy of ego draconis to a "dragon night saga" version of the divinity 2 series or straight to a "Flames of vengeance" add-on? I don't know if it would make a difference but it may be possible the developers assumed a player wouldn't buy the combo pack if they had the original and therefore made the save games from the stand-alone versions incompatible with the "Dragon Knight Saga" version.
