Where are you seeing that 4th draft? I have a copy of the Art of Star Wars (from 1979) which has the "Revised Fourth Draft" dated January 15, 1976. In it, that scene plays like in the theatrical cut.
I just looked on the webs and I found this from IMSDb which also has the scene as it appears in the original film.
JEDIT: I seem to have found what you're referring to:
http://starwars.rossiters.com/binaries/sw_revised4th-draft.txt
This one is dated March 15, 1976.
Why the discrepancy between the two? And are there other differences?