This is the Ordaz matte. The black, unpainted spot is where the live-action droid element was going to be inserted. This was after Luke had placed the saber inside R2 and sent them on their way.

A bit of clarification from my post up above. That script was from the revised draft. I don't *think" it was filmed. But this other stuff was from the shooting script. They even went so far as to commission a matte for it and shot live action elements. Was it ever composited together and finished? I don't know. But the pieces were done.

#16 is the Ordaz matte with the live action element included. You can see the droids at the entrance.