Core/Unit: Fixed race condition when loot recipient is in different map

src/server/game/Entities/Unit/Unit.cpp

@@ -11482,8 +11482,30 @@ void Unit::Kill(Unit* victim, bool durabilityLoss)
             creature->SetLootRecipient(nullptr);
     }
 
-    if (isRewardAllowed && creature && creature->GetLootRecipient())
-        player = creature->GetLootRecipient();
+    if (isRewardAllowed && creature)
+    {
+        if (Player* lootRecipient = creature->GetLootRecipient())
+        {
+            // Loot recipient can be in a different map
+            if (!creature->IsInMap(lootRecipient))
+            {
+                if (Group* group = creature->GetLootRecipientGroup())
+                {
+                    for (GroupReference* itr = group->GetFirstMember(); itr != nullptr; itr = itr->next())
+                    {
+                        Player* member = itr->GetSource();
+                        if (!member || !creature->IsInMap(member))
+                            continue;
+
+                        player = member;
+                        break;
+                    }
+                }
+            }
+            else
+                player = creature->GetLootRecipient();
+        }
+    }
 
     // Exploit fix
     if (creature && creature->IsPet() && creature->GetOwnerOrCreatorGUID().IsPlayer())