Can't kick party member while in duty?

I was in a dungeon today with a party I formed with my FC. We had four players and one of them disconnected halfway through the dungeon and did not return. After waiting 15 minutes I decided to kick him as the party leader. However, the only options I had as the party leader was to either view the player's search info or vote kick. Lo and behold, vote kick does not work on a party that was formed outside of duty finder. So our only option was to leave the duty. Once out of the duty, I then had the options to kick the player from the party, but the duty had ended and all progress lost.

SE, this is a problem and is something that should be addressed.