This is also bugged, quest items don't drop. The quest after this is also bugged. Perfumes don't drop either. Mushkingdom questline is bugged after the first quest (the spore one), when talking to Secretary of Defense, he prompts you to walk to the barrier, but quest won't autocomplete.

Gourd doesn't spawn when dropping seed on Nolbu's roof

Partly fixed on develop (live at next publish), partly in progress. FIXED: Gingerbread Man (Witch's Treasure Chest) — the reward flower was wrongly flagged unique, so turn-in refused whenever you already held one. STILL WORKING: Goldrichie NPC placement, Cause & Effect (Arwen turn-in), Shining Stone link, Mushroom Kingdom barrier auto-complete, and the Nolbu's-roof gourd. NOTE: the "Disappeared Santa Encyclopedia" items and the perfumes are genuinely unsourced — their real event source isn't in our reference, so they're not a simple drop fix; I'll flag if we can source them. More to come.

Update: "The Cause and Effect" (Arwen) is now fixed on develop — the turn-in NPC wiring was being dropped for two-NPC quests; live at next publish. Still fixed earlier: Gingerbread Man. Now confirmed as genuine content GAPS (not quick wiring): the Nolbu's-roof Gourd needs monster 9500400 extracted into our mob data (it isn't in the game yet), and the "Santa Encyclopedia" items + the perfumes are unsourced (their real event source isn't in our reference) — I won't fabricate a drop for those. Still working: Goldrichie NPC placement, Shining Stone link, and the Mushroom Kingdom barrier auto-complete.

Update — the rest of this report is now fixed on develop (live at next publish), and I was wrong earlier to call two of these 'unsourced'.

• Shining Stone: touching the Shiny Stone now registers for the quest (its completion counter had no in-game trigger), so it completes at Sharyl again.
• Mushroom Kingdom barrier: 'Exploring Mushroom Forest' now auto-progresses when you reach the barrier map, so it completes at the Secretary.
• Disappeared Santa Encyclopedia: the 6 volumes ARE in our data — they just had no drop source. The quest text says to find them from monsters (a Christmas event global drop), so they now drop from any monster while the quest is active.
• Perfumes: same class of bug — the Kerning Square perfume quest's Blue/Yellow/Pink Perfumes now drop from the matching Perfume monsters at the authentic rate (their drop tables were missing the perfume).
• Nolbu/Hongbu Gourd: the Gourd monster (9500400) is now in the game, is summoned when you plant the seed on the roof, and drops the quest item on death.
• Cause & Effect and Gingerbread Man: fixed earlier.

One deliberate exception — Gold Richie (2084001): v83's own map data never places him in the world (he was a limited-time 2002 event NPC), so placing him would be inventing a spawn. His two quests stay available from the Premium Road vending machine, which is the correct home for event quests that have no in-world giver. Re-test after next publish.

Live in the latest publish — marking this Fixed. Thanks for the report!