fix(DB/GameObject): correct Higher Learning pooled respawn cycle (#26439)

data/sql/updates/pending_db_world/rev_1783977805714123300.sql

@@ -0,0 +1,28 @@
+-- Higher Learning
+UPDATE `smart_scripts` SET
+    `action_type` = 41,
+    `action_param1` = 0,
+    `action_param2` = 0,
+    `action_param3` = 0,
+    `action_param4` = 0,
+    `action_param5` = 0,
+    `action_param6` = 0,
+    `comment` = 'Higher Learning - Timed Event Triggered - Force Despawn'
+WHERE `entryorguid` IN (
+    192708, 192706, 192871, 192905,
+    192710, 192886, 192869, 192880, 192895,
+    192713, 192889, 192890, 192894, 192884,
+    192866, 192891, 192872, 192881,
+    192709, 192883, 192651, 192888,
+    192711, 192653, 192887, 192652,
+    192865, 192874, 192868, 192870, 192885,
+    192867, 192882, 192707, 192896
+)
+  AND `source_type` = 1
+  AND `id` = 1
+  AND `link` = 0
+  AND `event_type` = 59
+  AND `event_param1` = 1
+  AND `action_type` = 99
+  AND `action_param1` = 3
+  AND `target_type` = 1;

src/server/game/Entities/GameObject/GameObject.cpp

@@ -962,7 +962,10 @@ void GameObject::DespawnOrUnsummon(Milliseconds delay /*= 0ms*/, Seconds forceRe
             }
 
             uint32 poolid = m_spawnId ? sPoolMgr->IsPartOfAPool<GameObject>(m_spawnId) : 0;
-            if (poolid)
+
+            // Keep the current pooled gameobject reserved until its respawn timer expires.
+            // GameObject::Update() will update the pool when the object is ready to respawn.
+            if (poolid && !m_respawnTime)
             {
                 sPoolMgr->UpdatePool<GameObject>(poolid, m_spawnId);
             }