PyQT5 No Taskbar Details after Splash Screen

Hello,

I know this is a QT Forum and no specified PyQT / Python forum
But The problem I face maybe is "so easy" but I can't see the solution

I have this Python Code.

First I open an QMainWindow as Splash Screen, while I load the settings, customers, sales etc..

But When I close the Splash Screen, and open the Main Screen, the taskbar details disappeared!

This is the code:

Code:

from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.uic import loadUiType
import os
import sys
import time
 
 
 
class ThreadProgress(QThread):
    mysignal = pyqtSignal(int, str)
 
    def __init__(self, parent=None):
        QThread.__init__(self, parent)
 
    def run(self):
        i = 0
        while i < 102:
            time.sleep(0.02)
            self.mysignal.emit(i, "txt")
            i += 1
 
 
FROM_SPLASH, _ = loadUiType(os.path.join(os.path.dirname(__file__), "splash.ui"))
FROM_MAIN, _ = loadUiType(os.path.join(os.path.dirname(__file__), "mainwindow FRAME.ui"))
 
 
class Main(QMainWindow, FROM_MAIN):
    def __init__(self, parent=None):
        super(Main, self).__init__(parent)
        self.setupUi(self)
 
 
class Splash(QMainWindow, FROM_SPLASH):
    def __init__(self, parent=None):
        super(Splash, self).__init__(parent)
        QMainWindow.__init__(self)
        self.setupUi(self)
 
        pixmap = QPixmap("splash_logo.png")
        self.splah_image.setPixmap(pixmap.scaled(350, 152))
 
        progress = ThreadProgress(self)
        progress.mysignal.connect(self.progress)
        progress.start()
 
    @pyqtSlot(int, str)
    def progress(self, i, txt):
        if i == 101:
            self.close()
            self.setStyleSheet("")
            main = Main(self)
            main.show()
        self.progressBar.setValue(i)
        self.SubText.setText(txt)
 
 
 
def main():
    app = QApplication(sys.argv)
    splash = Splash()
    splash.show()
 
    app.exec_()
 
 
if __name__ == '__main__':
    try:
        main()
    except Exception as why:
        print(why)

Can you suggest me a solution?

Thank you very much