"The bacta tank scene starts on a close-up of Two-One-Bee and pans right to a closeup of Luke in the tank. It then cuts to FX-7 extending it's arm to the tank. There is no cut to Leia, Han and Threepio observing."
This might be part of that footage that was replaced with Leia, Han and Threepio observing that Mike Matessino described in FSM:
^ This unique footage appeared in the '79 teaser trailer, the one with the Harrison Ford narration.