Why wouldn't he though? Among other things, the producer's job is to help accomodate the director and get him what he needs in order to help the film get made. There's no reason why Lucas wouldn't have told Kurtz that the scene was problematic. It just doesn't make sense. There are millions of problems like this that happen on movie sets. Lucas is going to keep quiet about this one thing?
Lucas is on pretty thin ice with this one, Gomer...come on, you have to see it...