[Destiny 2] Sword Dance Cyst bugged?

So, the challenge for the Sword Dance Cyst in The Pale Heart of the Traveler is "Master Of Swords: Complete the Sword Dance Cyst without ever dropping your Sword."

I did it tonight - still haven't managed it on a time trial, but may be easier with a fireteam to beat the time - without dropping the sword or dying. But I still didn't get the triumph. Between the Khvostov quest and the Micah-10 quests for the ship, I swear I've been doing these Cysts in my dreams. Not getting this triumph isn't the end of the world because it's not required for the seal/title, but it's just really goddamned annoying.

If anyone can see any reason I screwed it up, please let me know.