Fix quest required item display and add NPC spawn diagnostics

- Fix SMSG_QUESTGIVER_REQUEST_ITEMS: read emoteDelay(u32)+emoteId(u32)+autoFinish(u8)
  instead of 5 uint32s — the 11-byte over-read corrupted requiredMoney, itemCount,
  and all item data (itemId/count/displayInfoId)
- Fix garbled CSV fallback in asset_manager: return nullptr instead of silently
  returning garbled DBC data when binary fallback is unavailable
- Add NPC spawn diagnostics: log when UNIT blocks have displayId=0 (wrong field index)
  and when spawn callback fires with displayId + position
- Improve getModelPathForDisplayId failure logging: distinguish displayDataMap_ miss
  vs modelIdToPath_ miss, and include map sizes for context

src/core/application.cpp

@@ -2950,11 +2950,18 @@ std::string Application::getModelPathForDisplayId(uint32_t displayId) const {
         }
         if (displayId == 30412) return "Creature\\Gryphon\\Gryphon.m2";
         if (displayId == 30413) return "Creature\\Wyvern\\Wyvern.m2";
+        LOG_WARNING("No display data for displayId ", displayId,
+                    " (displayDataMap_ has ", displayDataMap_.size(), " entries)");
         return "";
     }
 
     auto itPath = modelIdToPath_.find(itData->second.modelId);
-    if (itPath == modelIdToPath_.end()) return "";
+    if (itPath == modelIdToPath_.end()) {
+        LOG_WARNING("No model path for modelId ", itData->second.modelId,
+                    " from displayId ", displayId,
+                    " (modelIdToPath_ has ", modelIdToPath_.size(), " entries)");
+        return "";
+    }
 
     return itPath->second;
 }

src/game/game_handler.cpp

@@ -3436,6 +3436,10 @@ void GameHandler::handleUpdateObject(network::Packet& packet) {
                         unit->setHostile(isHostileFaction(unit->getFactionTemplate()));
                     }
                 // Trigger creature spawn callback for units/players with displayId
+                    if (block.objectType == ObjectType::UNIT && unit->getDisplayId() == 0) {
+                        LOG_INFO("[Spawn] UNIT guid=0x", std::hex, block.guid, std::dec,
+                                 " has displayId=0 — no spawn (entry=", unit->getEntry(), ")");
+                    }
                     if ((block.objectType == ObjectType::UNIT || block.objectType == ObjectType::PLAYER) && unit->getDisplayId() != 0) {
                         if (block.objectType == ObjectType::PLAYER && block.guid == playerGuid) {
                             // Skip local player — spawned separately via spawnPlayerCharacter()
@@ -3451,6 +3455,9 @@ void GameHandler::handleUpdateObject(network::Packet& packet) {
                                 }
                             }
                         } else if (creatureSpawnCallback_) {
+                            LOG_INFO("[Spawn] UNIT guid=0x", std::hex, block.guid, std::dec,
+                                     " displayId=", unit->getDisplayId(), " at (",
+                                     unit->getX(), ",", unit->getY(), ",", unit->getZ(), ")");
                             creatureSpawnCallback_(block.guid, unit->getDisplayId(),
                                 unit->getX(), unit->getY(), unit->getZ(), unit->getOrientation());
                         }

src/game/world_packets.cpp

@@ -2931,50 +2931,35 @@ bool QuestRequestItemsParser::parse(network::Packet& packet, QuestRequestItemsDa
     data.title = packet.readString();
     data.completionText = packet.readString();
 
-    LOG_INFO("QRI raw: packetSize=", packet.getSize(),
+    if (packet.getReadPos() + 9 > packet.getSize()) {
-             " posAfterStrings=", packet.getReadPos(),
-             " remaining=", packet.getSize() - packet.getReadPos());
-
-    if (packet.getReadPos() + 20 > packet.getSize()) {
         LOG_INFO("Quest request items (short): id=", data.questId, " title='", data.title, "'");
         return true;
     }
 
-    // Log each skipped field so we can verify the offset count
+    // emoteDelay (uint32) + emoteId (uint32) + autoFinish (uint8) = 9 bytes
-    uint32_t f1 = packet.readUInt32();
+    // (same format in vanilla 1.12 and WotLK 3.3.5a)
-    uint32_t f2 = packet.readUInt32();
+    /*uint32_t emoteDelay =*/ packet.readUInt32();
-    uint32_t f3 = packet.readUInt32();
+    /*uint32_t emoteId    =*/ packet.readUInt32();
-    uint32_t f4 = packet.readUInt32();
+    /*uint8_t  autoFinish =*/ packet.readUInt8();
-    uint32_t f5 = packet.readUInt32();
-    LOG_INFO("QRI fields: f1=", f1, " f2=", f2, " f3=", f3, " f4=", f4, " f5=", f5,
-             " (emoteDelay/emote/autoClose/flags/suggestedPlayers)");
 
     if (packet.getReadPos() + 4 > packet.getSize()) return true;
     data.requiredMoney = packet.readUInt32();
-    LOG_INFO("QRI requiredMoney=", data.requiredMoney);
 
     if (packet.getReadPos() + 4 > packet.getSize()) return true;
     uint32_t requiredItemCount = packet.readUInt32();
-    LOG_INFO("QRI requiredItemCount=", requiredItemCount,
-             " posBeforeItems=", packet.getReadPos());
 
     for (uint32_t i = 0; i < requiredItemCount && requiredItemCount < 20; ++i) {
         if (packet.getReadPos() + 12 > packet.getSize()) break;
-        uint32_t raw0 = packet.readUInt32();
-        uint32_t raw1 = packet.readUInt32();
-        uint32_t raw2 = packet.readUInt32();
-        LOG_INFO("QRI item[", i, "]: raw0=", raw0, " raw1=", raw1, " raw2=", raw2);
         QuestRewardItem item;
-        item.itemId = raw0;
+        item.itemId = packet.readUInt32();
-        item.count = raw1;
+        item.count = packet.readUInt32();
-        item.displayInfoId = raw2;
+        item.displayInfoId = packet.readUInt32();
         if (item.itemId > 0)
             data.requiredItems.push_back(item);
     }
 
     if (packet.getReadPos() + 4 > packet.getSize()) return true;
     data.completableFlags = packet.readUInt32();
-    LOG_INFO("QRI completableFlags=", data.completableFlags);
 
     LOG_INFO("Quest request items: id=", data.questId, " title='", data.title,
              "' items=", data.requiredItems.size(), " completable=", data.isCompletable());

src/pipeline/asset_manager.cpp

@@ -300,7 +300,8 @@ std::shared_ptr<DBCFile> AssetManager::loadDBC(const std::string& name) {
                 }
                 LOG_INFO("Binary DBC fallback succeeded: ", name);
             } else {
-                LOG_WARNING("No binary DBC fallback available for: ", name);
+                LOG_ERROR("No binary DBC fallback available for: ", name, " — discarding garbled CSV");
+                return nullptr;
             }
         }
     }