There seems to be a bug for testie festies when you reload the check point while the player is trying to pop the balloons. When you do complete it and wake up in the fields, the mission never officially completes. There's also another bug in Faith's region where the milestone missions do not pop up after the mission "a leap of faith". https://forums.ubi.com/showthread.php/1864007-Gamebreaking-bug-Faith-Seed-Mission-Forums