Just thought of something, anent questlines.
During my first playthrough I met Irina in the Weeping Peninsula, who asked me to deliver a letter to her father in Castle Morne. I went there, defeated the Leonine Misbegotten boss, and received a sword. Only after this did I meet Edgar—Irina's father—for the first time, and his dialogue went along the lines of "I won't leave my post, not as long as my duty is not fulfilled, not as long as the sword of Morne is in the wrong hands." No matter I already had said sword...
Being familiar with the jankiness of FromSoft's quests, I rested at a grace site (thus resetting the world's state) before coming back to Edgar, and sure enough now he acknowledged my possession of the sword, so that his dialogue and questline progressed.
This was right when the game came out, playing on v1.02. Since then it has changed: Edgar will acknowledge your possessing the sword of Morne when you meet him the first time. I believe patch 1.03 brought that change.
For another thing, during my last playthrough (on 1.04), I could not tell Brother Corhyn of Goldmask's whereabouts if Corhyn had yet to leave the Roundtable Hold. So Corhyn told me he was searching for Goldmask, and I had already met Goldmask, but nonetheless was not offered the option to tell Corhyn—not before he moved out to the road on Altus Plateau.
So, since Brother Corhyn's quest is quite a lot more consequential than Edgar's but has not been touched, I can only suppose that FromSoft—who modified a quest here, a quest there—is fine with the ass-backwards way the first step of Corhyn's quest must be handled.
I'll forever be impressed with the way From can manage some of the most minuscule details in their games, yet with equal mastery can completely fudge even the most basic interactions with NPCs.