Scripts/InstanceScript: Implement database framework for managing spawn groups based on boss state. (#20103)

(cherry picked from commit 84590be26d)

src/server/game/Maps/Map.cpp

@@ -4123,6 +4123,8 @@ void InstanceMap::CreateInstanceData(bool load)
             }
         }
     }
+    else
+        i_data->Create();
 }
 
 /*