Usually, Roblox swords are supposed to be held upright. Many of these swords are supposed to be stood upward. But when it comes to this gear, it lays flat in your hand instead of being held upright like a usual sword. Here is a comparison using the bugged item and a item without this issue.
What should be happening: the sword being in a upright position.
If fixed, then the gear should be held in a proper position, (holding the sword up.) Then the sword would be upright and the issue would be fixed, which would make the item work properly.
I also noticed on the unofficial wiki page that the Great Sword Justice gear functions as a back accessory too, so it would be pretty neat to see that functionality return in the future.