Blackscreen when activating qtvirtualkeyboard in Desktop Mode

[PaulsWidgets]

When implementing a virtual Keyboard in my Programm it takes up the whole Screen and blocks my own GUI. I use the Desktop Implementation of the virtual keyboard in my QtWidget based Application that is running on a Raspberry Pi. I am running Qt 5.15.2 with qtvirtualkeyboard 2.2.

This is how the Keyboard is implementet in my main.cpp.

#include "mainwindow.h"
#include <QApplication>
#include <QTranslator>
#include <QLoggingCategory>

int main(int argc, char *argv[])
{
    //um das Modbusprotokoll komplett zu debuggen kann die nachfolgende Zeile einkommentiert werden.
    //QLoggingCategory::setFilterRules(QStringLiteral("qt.modbus* = true"));

    #ifdef LINUX
        qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
        qputenv("QT_LOGGING_RULES", QByteArray("qt.virtualkeyboard=true"));
    #endif
    QApplication a(argc, argv);

    QTranslator translator;
    translator.load(QLocale(),"modbusReader","_",".");
    a.installTranslator(&translator);
    MainWindow w;

    w.show();

    return a.exec();
}

And this is how the Keyboard is shown- As you can see it covers the whole screen.