I have created an application using PyQt6 and integrated a QTableWidget in my UI using Qt Designer. I promoted this QTableWidget to my custom class TableWidget. The application works fine when running normally, but when I try to package it using Briefcase, I get the following error:ModuleNotFoundError: No module named ‘tablewidget’
How can I resolve this issue and ensure that my promoted classes are correctly recognized when packaging with Briefcase? Any help or pointers would be greatly appreciated.

In Qt Designer, I promoted the QTableWidget to TableWidget.
Promoted class name: TableWidget
Header file: tablewidget.h
My custom TableWidget class is defined in tablewidget.py

tablewidget.py:

from PyQt6.QtWidgets import QTableWidget

class TableWidget(QTableWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        # custom initialization code

To troubleshoot, I demoted the QTableWidget back to the standard QTableWidget in Qt Designer and created an object of my custom TableWidget class in the code, which worked. However, I have other promoted classes in my application, so I would prefer if the promoted classes are recognized correctly.