I helped heal Haukke Manor for my friend and his wife's first run yesterday and ran into a bug that resulted in not being able to finish the duty.

We just finished killing the Manor Jester and Manor Steward that drops the Bloody Parchment before you head to the Sealed Barrier. The Bloody Parchment dropped, but none of us were able to pick it up.

Here were some things we tried that didn't help and we still couldn't pick up the parchment:
We attempted logging out and logging in.
Found a pack of mobs that were still alive and died to them and then ran back.
Only other option was to leave the duty, which ended the dungeon run.