Maybe an unused take of the race to the Falcon or the pad where Boba was taking off from? Meant to be a plate for a matte shot. Somewhere I’ve seen a still of a blue screen shot of Lando leading Han and the gang that was supposed to composited with a Cloud City exterior that never made it into the film.
It was used, the camera is above filming and they did have a shot from above when they were running to the Falcon with the matte painting around it. Cool image, I didn’t know it was shot outside.
Though it appears to be a different take/setup where Chewie is behind, rather than in the lead.