Helnim, Thieves Guild, 'The Midnight Meeting' quest. The conversation between Castav Munia and Telvanni agent is implemented in a form of force greetings. And Castav Munia is a Legion member, so if Nerevarine isn't wearing Legion uniform, he says 'Where's Your Uniform?' instead of quest lines. I also experienced unexpected stop of their conversation, the Telvanni agent went to the far end of dock and force greetings stopped happening. Perhaps reloading the save will fix it, I will try so and report. But the checking of Nerevarine wearing uniform must be removed or it can make the quest unpassable (unless the player puts on the uniform during the dialogue, but maybe even so the dialogue will be aborted as I have mentioned).