Missions working as intended or glitched?

Thanks guys, that makes sense. If I have to keep failing certain missions, I will follow that route. I figured the low level missions would stay as I got new level 1’s as those level 12 and 14 anima missions and 1200 exp missions helped heal my beaten up guys while also leveling up the new guys, but if they are officially gone, then I just got to do what I got to do lol. I hope blizzard revises it a little bit, because putting a level 1 in a mission my level 25-30’s can barely survive seems backwards