App crashes on debug mode when using qt virtual keyboard on win10(1809, 17763.593), Qt5.12.4

[Vevinlong]

Develop Environment:
OS: Windows 10 1809(17763.593)
Qt: 5.12.4

Hi, everyone, I have installed Qt 5.12.4 on my computer, then I try to run the virtual keyboard example:

It's ok to run without debugging:

But when I want to start debugging, it will crashes when the app have the focus by clicking it, and debug page change to this:

Actually, It's OK before 15 May on Qt 5.8, Qt 5.10, but one day, it crashes when I run my app. I code a test app, a mainwindow with a lineedit

int main(int argc, char *argv[])
{
//    qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));          //keyboard
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

It's OK to debug when comment out keyboad, but it will crash when uncomment it.

By the way, I find that it can be started when choose mingw 32-bit show as following:

Thanks!!!