A Jedi does not rummage for his lightsaber. He calls it with the force and it comes.
No matter how he retrieves it, that act cancels out the symbolism and meaning of him throwing it in the first place.
If he retrieved it during the battle with the Emperor, I would agree. After the battle, it makes little sense to throw away what for all we know may be the last lightsaber in existence. Being a Jedi doesn’t mean being wasteful.