Interesting. I did something similar in the destroyed village. I knew from my first play through, that they just let drow pass. So when I got there with my human acrane trickster, I used disguise self to pose as a drow. Sure enough they let me pass and when I droped my disguise afterwards, they didn't care that I wasn't actually a drow. Of course I needed to do the same at the watch post before the bridge.
Anyway, I think this is a limitation in the game - if you are done with a conversation, the game probably saves the outcome somewhere in order to "remember" what happened. I don't think that disguise self is factored in here. Basically in addition to the conversation's outcome itself, the game would have to remember, what you looked like or "who you were" so to speak. And then it would have to decide how those NPCs react to you the second time, depending on if you are yourself, or the person you pretended to be the last time.
This is probably way beyond the scope of the game. Then again, I'm not a developer or even a programmer, this is just how I think this works.
Last edited by Kasai; 16/04/21 06:55 AM. Reason: typos