When Luke is fighting Vader in Return of the Jedi, as the Emperor is egging him on, Luke stops. He turns off his saber and tosses it aside. Vader throws Palpatine over the edge, and Luke drags Vader to the shuttle. Since it wouldn't fit the narrative and take away from the story, we obviously don't see Luke pick it up (do we?).
Are we to assume that he lost another lightsaber (just as his father lost them frequently)?
Or do we assume it was recovered off-screen, maybe a force grab while dragging dying Vader?
Or, is this explained elsewhere?
Or do I just need to rewatch the film again? It's been a while, some details are fuzzy.