Fixed visual bug where accessory could detach from vehicle on client (#18590)

Closes #15153

src/server/game/Entities/Object/Object.cpp

@@ -1578,6 +1578,14 @@ bool WorldObject::CanSeeOrDetect(WorldObject const* obj, bool ignoreStealth, boo
                             corpseVisibility = true;
                 }
             }
+
+            if (Unit const* target = obj->ToUnit())
+            {
+                // Don't allow to detect vehicle accessories if you can't see vehicle
+                if (Unit const* vehicle = target->GetVehicleBase())
+                    if (!thisPlayer->HaveAtClient(vehicle))
+                        return false;
+            }
         }
 
         WorldObject const* viewpoint = this;