I just queued for deep dungeon with a friend as party leader, and we selected to have players added to our group, instead of a preformed group. When we finished with floor 10 I wasn't given the ability to save. When we tried to move on we were told we couldn't due to gear, so we repeated 1-10 and once again I wasn't able to save.

When I checked the NPC later both of my save slots had been filled. This seems like a big issue; if the purpose of the two save slots is to allow for different job choices or different party formation choices, and it autofills/overwrites them in the scenario I was just a part of, what is the point? It seems like very little testing was done here.