This will mandate a change in how part breaks are recorded for the purpose of such part break counts.
Currently, part break quests can be fulfilled without slaying a single large monster—just break a body part, clock the part break count, then leave the hunt, and then attempt the hunt again. Repeat until you complete the part break quest. It is really lame to just keep breaking the Great Jagras Stomach for 1 hour before it gets despawned at the hourly respawn interval.
Part break counts should only be tallied after the large monster is slain, not before. Then, this would make part break quests and medals more like actual achievements rather than a trivial chore.