The accessory glitches out and elongates randomly during combat
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Stuff like that can often times be related to your graphics card drivers. Make sure that they are up to date, or if they are, try a clean reinstall of them. I would usually also recommend doing a file check for the game as it could also be corrupted files, but with all the installation issues, I hesitate to do so.
@AndrlCh no luck, in the first place I always do a clean install of my drivers by uninstalling it with DDU and install a clean driver without GEFORCE EXPERIENCE, but i tried what you said and verified my game files and reinstalled my driver(its the latest version).
I'll take this as a game bug for now until further inspection. If others who have the item report they have any problems with pairing this accessory with the katana braver moveset, we could futher pinpoint the source of the problem.