Let’s take a look at all the limbs and appendages that get lost in the Star Wars movies. If you count Darth Maul losing his legs in The Phantom Menace (which you can since The Clone Wars confirms that he survived Obi-Wan cutting him in half) every movie has some kind of dismemberment.
But the real mystery of missing limbs starts with C-3PO in the first scene of A New Hope. Many people don’t realize this but the golden droid isn’t completely gold right from the beginning. His right leg from the knee down is actually silver. The Expanded Universe tried to explain how he got this one silver part in crazy ridiculous stories. But do we really need everything explained to us? It’s been glimpsed that 3PO now has a red arm in The Force Awakens. What kind of crazy explanation are we going to get for that?