SimpleSTRtree use remove return true,but SimpleSTRtree data not change

[daijie1991]

std::unique_ptr<geos::index::strtree::SimpleSTRtree> stRtree;
std::shared_ptr<AlgoGeoElement> algoGeoElement;
stRtree->insert(algoGeoElement->getJstGeometry()->getEnvelopeInternal(),geoElement);

 for (auto it = elementMap.begin(); it != elementMap.end();) {
        if (it->second.get()->getId() == id) {
            bool isRemove = stRtree->remove(it->second->getJstGeometry()->getEnvelopeInternal(),
                                            it->first);
            if (isRemove) {
                  for (auto &node: it->second->getPointMap()) {
                    for (std::size_t i = 0; i < node.second.get()->getSize(); ++i) {
                        kdTree->insert(node.second.get()->getAt(i), nullptr);
                    }
                }
}

isRemove is true,stRtree data not delete?

geos::geom::Envelope envelope;
    envelope.expandToInclude(x, y);
    envelope.expandBy(searchRadius);
    std::vector<void *> result;
    AlgoGeoManager::stRtree->query(&envelope, result);

result is empty

[dr-jts]

Does this only happen with specific data? If so, can you provide data which exhibits the problem?