I've just done a playtest of Morgiah's Wedding in vanilla Daggerfall. When handing the letter to King of Worms and his reply to Morgiah, the item is removed from your inventory. In DFU they both remain until the quest is marked as Finished. I suspect the same thing occurs when handing the death certificate to Lhotun at the end of Missing Prince, but I haven't got that far in vanilla yet.
Edit: OK, I've now completed Missing Prince in vanilla as well. Observations:
- The death certificate is removed from your inventory upon handing it to Lhotun and receiving your reward.
- The journal entries are also cleared.
- It's not possible to subsequently hand the death certificate to Akorithi or the others after giving it to Lhotun. You can speak with them, receive noble quests etc. as normal.
- The quest debugger indicates Sx001 is still running and Lhotun is non-interactive as expected.
- Lhotun's initial letter to you and the letter from the Underking's agent are retained after quest hand-in, as in DFU.
- I did not receive the second quest journal entry after meeting the Underking's agent. Presumably an error in vanilla script that's been corrected for DFU. However, that exposed another oversight - task S.00 lacked an entry remove log step 1 in addition to step 0 in order to clear the journal properly. Adding it to my quest file seemed to do the trick.
And the difference in dungeon selection which has already been noted elsewhere.
Looking at the quest script along with those of other quests, it seems toting anItem and anNPC clicked
in vanilla is meant to remove the item in question (or I could have just looked at Donald Tipton's documentation a little closer and saved me some time - doh!). At the moment it looks like DFU doesn't do this.
Speaking of Tipton's documentation, mute npc anNPC (currently unimplemented according to roadmap) allegedly causes an NPC to ignore mouse clicks from the player, but in practice I can still interact with everyone besides Lhotun in vanilla after Sx001's quest hand-in (stage S.00) as noted above. Not sure what that means.
That's it for now. Whew!
PS: On an unrelated note, I stumbled on a town during Jester's Day during testing, which had a %t[unhandled] macro in the popup text. According to UESP and Tipton's doc this is a ruler's title.