Qt6 QWebEngine Plotly js: Uncaught Error: Something went wrong with axis scaling

Question

I.m using Qt 6.6.3, VS 2022, python 311 to plot something like 3D image. When I create QWebEngineView object like

    ui.setupUi(this);

    webEnginePlot = new QWebEngineView(tabPlot);
    webEnginePlot->setObjectName("webEnginePlot");
    webEnginePlot->setUrl(QUrl(QString::fromUtf8("about:blank")));

MainWindow include

[ MenuBar ] [QDockWidget QStackedWidget]

QDockWidget on the left, QStackedWidget on the right. QDockWidget include QTreeView, QStackedWidget include QWebEngine

Question 1: Why the whole surface flashing(or hide, or white screen) 1 or 2 seconds? I found out it is loading QtWebEngineProcessd.exe

When I try to new QWebEngineView() before QTreeView init, nothing wrong. And when I init QTreeView first, then new QWebEngineView(), and the whole soft began to flashing(or hide, or white screen) to loading the QtWebEngineProcessd;

Question 2: I use C++ PythonAPI to draw a plot using plotly, and come out a file like a.html, and then I load the html file with QWebEngineView, and it showed up "js: Uncaught Error: Something went wrong with axis scaling"

    QUrl localUrl = QUrl::fromLocalFile(htmlFile);
    ui.webEnginePlot->setUrl(localUrl);
    ui.webEnginePlot->show();

But when I enter the QWidget and click my button to draw it again, and it works. Why when initializing, it will report an error？

How to solve the problem. Help me please!