When I'm swordless and i save/die, it turns into a deku stick and we can do BA, by the way. Is it lied at this glitch?
You must have equipped a sword atleast once before saving/dying in order for it to turn into a deku stick. Otherwise it'll turn blank.
That is why NG+ files can't save and die. The same goes for a file that uses the Lon Lon Stick method for getting an item on B. If you die or save after that, the B button gets blank.