OpenGLRhi causes abnormally high memory useage when providing QML Image source QQuickImageProvider

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQuickImageProvider>
#include <QQuickWindow>

class ImageProvider: public QQuickImageProvider
{
public:
    ImageProvider():QQuickImageProvider(QQuickImageProvider::Image)
        ,image(100, 100, QImage::Format_RGB888)
    {
        image.fill(Qt::black);
    }
    QImage requestImage(const QString &id, QSize *size, const QSize& requestedSize) override
    {
        *size = image.size();
        return image;
    }
    QImage image;
};

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    //Switch between OpenGL and OpenGLRhi to see difference
    QQuickWindow::setSceneGraphBackend(QSGRendererInterface::OpenGL);
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.addImageProvider("ImageProvider", new ImageProvider());

    const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
        &app, [url](QObject *obj, const QUrl &objUrl) {
            if (!obj && url == objUrl)
                QCoreApplication::exit(-1);
        }, Qt::QueuedConnection);
    engine.load(url);

    return app.exec();
}

import QtQuick 2.15
import QtQuick.Window 2.15

Window {
    id: root
    width: 640
    height: 480
    visible: true

    property int counter
    Timer {
        running: true
        repeat: true
        interval: 5
        onTriggered: {
            counter++
            if (10000 < counter) {
                counter = 0
            }
        }
    }
    Column {
        Repeater {
            id: _repeater
            model: 100
            delegate: Image {
                id: img
                cache: false
                source: "image://ImageProvider/" + (counter + index)
            }
        }
    }
}