Wasn’t there some hurt feelings over a storyline Lucasfilm ordered changes to? Or was that someone else’s plot?
I’m not sure. Jo Duffy says Lucasfilm got rather imperious after RoTJ (in terms of what characters/concepts were allowed) but, beyond the suddenness of the cancellation, I’m not aware of particular plot issues. I do know JM DeMatteis had issues with the last page of his story (the one with Cody Sun-childe) which was why he was under a pseudonym when they changed it.