When you get the Mission from Nix called Spellbound, Your initial conversation response "Indeed" already pops up before its supposed to. Even though you select it to start the Mission Dialogue, it remains as a selectable option AGAIN with the 2 Yellow and 1 Blue response to accepting or declining the mission. If you select "Indeed" again, it puts the conversation into a a single repeat and breaks the dialogue from being progressed, giving you NO CHOICES to accept or decline the mission thus breaking the mission.