There are a lot of early internet rumours on that linked page, always fun to read mid-90s myths.
“A friend of mine was just telling me about the Leia-Vader torture scene. She said that she was reading an interview with Carrie Fisher, and in the article she described the scene as the most awful day of filming on the set. She described the scene in very much the same way it was portrayed in the [NPR] radio drama. She described being hung upside down while they filmed her being tortured until she eventually passed out. She then noted how pissed she was when she saw that it had been cut from the movie”