Found a bug related to Robin's Request.
After completing the quest I were unable to find her in the Nostalgic Home, despite having all the hats. I think I had one of the hats equipt during the dungeon, I dont remember if it was equipt on an active party member or not. I tried to unequip it and re-enter Nostalgic Home, but Robin did not appear.
Had to manually activate flag 4895: Magekiller Hat, for Robin to appear.
I have the Red, Green, Blue and Gray hat, for the record.
Savefile without alteration: https://we.tl/t-rpFLtgmPAh