Rendering of second QML WebEngineView in same window is buggy

When displaying two WebEngineView in the same window (typically, a website and dev tools), the second one is badly rendered after resizing. It looks pixelated, as if its internal buffer's size didn't match its display size.

Here is a minimal example:

#include <QtWebEngineQuick/qtwebenginequickglobal.h>
#include <QApplication>
#include <QQmlApplicationEngine>


int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts);
    QtWebEngineQuick::initialize();

    QApplication app(argc, argv);
    QQmlApplicationEngine engine;
    engine.load("MainWindow.qml");

    return app.exec();
} 

import QtQuick
import QtQuick.Window
import QtWebEngine

Window {
    height: 500
    width: 1000
    visible: true
    
    WebEngineView {
        width: parent.width
        height: parent.height / 2
        url: "https://www.wikipedia.com"
    }
    
    WebEngineView {
        width: parent.width
        height: parent.height / 2
        y: parent.height / 2
        url: "https://www.wikipedia.com"
    }
}

Additionnally, I also tried in the quicknanobrowser example: if you just change the devtool view's height to be dynamic (for example parent.height / 2) instead of a fixed 400 (BrowserWindow.qml, line 625), you get the same bug after resizing the browser window.

This happens on Linux/X11, on Linux/Wayland (but less noticeable) but works fine on Windows.