QAbstractItemModelReplica onRowsRemoved assert failure

void QAbstractItemModel::beginRemoveRows(const QModelIndex &parent, int first, int last) {
    Q_ASSERT(first >= 0);
    Q_ASSERT(last >= first);
    Q_ASSERT(last < rowCount(parent));	// failure, beginRemoveRows called on empty model
    Q_D(QAbstractItemModel);
    d->changes.push(QAbstractItemModelPrivate::Change(parent, first, last));
    emit rowsAboutToBeRemoved(parent, first, last, QPrivateSignal());
    d->rowsAboutToBeRemoved(parent, first, last);
}

void QAbstractItemModelReplicaImplementation::onRowsRemoved(const IndexList &parent, int start, int end) {
    qCDebug(QT_REMOTEOBJECT_MODELS) << Q_FUNC_INFO << "start=" << start << "end=" << end << "parent=" << parent;

    // my guess, onRowsRemoved is called before model size sync and this check is buggy
    bool treeFullyLazyLoaded = true;
    const QModelIndex parentIndex = toQModelIndex(parent, q, &treeFullyLazyLoaded);
    if (!treeFullyLazyLoaded) return;

    // beginRemoveRows is called on empty model
    auto parentItem = cacheData(parentIndex);
    q->beginRemoveRows(parentIndex, start, end);
    if (parentItem) parentItem->removeChildren(start, end);
    q->endRemoveRows();
}