The music was slightly extended in parts beginning during the sequence where Han is being loaded onto the Slave 1. Why exactly I’m not sure. Perhaps they wanted the music to continue up til it cut back to Luke and Vader. There’s also difference in timing for the music during the actual escape too (partly due to extending Lando’s evacuation announcement). The closing cue that’s suppose to hit when it cuts to the exterior of the platform where the final duel takes place now happens about two seconds before actually cutting to the shot.
I agree that the scene played out perfectly with no music following “Oh no, Chewie they’re behind you!”, and save the big ‘musical’ escape for when they reach the Falcon. IMHO it also set up a better transition back to Luke/Vader, but yes I think this ^^ is why they added it back in.
This was a 1997 Special Edition change.