Stuck on final Windhurst mission

Platform:
Windows

ISP:
Charter

Type of Internet Connection:
Optic Fiber

Internet Connection Speed:
40 MBPS

Date & Time:
I do not recall exactly. I believe it was in December of 2017

Frequency:
Once, but the issue is ongoing.

Character Name:
Saiben

Race:
Hume

World:
Occurred on Odin, though I have since transferred to Asura.

Main Job:
Ninja

Support Job:
Dancer

Area and Coordinates:
Heaven's Tower, at the Vestal Chambers entrance

Party or Solo:
Solo

NPC Name:
None

Monster Name:
None

Steps:
At the time the issue occurred, I was working on Windhurst rank mission 9-2, Moon Reading. I had gotten the initial cutscene from Heaven's Tower, retrieved the three key items from Ro'Maeve, Temple of Uggalepih, and Chamber of Oracles, then proceeded to defeat the battle in Full Moon Fountain. I then returned to Heaven's Tower for the final cutscene of the mission, and during this cutscene, I had a disconnection. Upon logging back in, I seemed to be stuck somewhere between having finished the mission and not. I didn't advance in rank, or receive the rewards, the mission is still listed in my current missions list, but certain NPCs, such as Kupipi, give dialogue suggesting I have finished the mission. I have backtracked through every step of the mission, hoping to be able to pick it back up, to no avail.