It seems like my cca component doesn't apply to swords, everything else works for my empty packet item.
The sword supplies the component, but when I try write data it doesn't work, but it works for my empty packet item.

If you need anymore information just tell me!
(btw there is nothing in my logs)

So the component exists on swords, but its data is never saved ? Could I see your registration code ?

Hello! I'm extremely sorry but I just realised that this is not a cca problem, I have fixed it, I forgot to check something.
Sorry for wasting your time!
Good luck with cca!