PySide2extn перестала работать с PySide6

Интерфейс:

from PySide6.QtCore import (QCoreApplication, QDate, QDateTime, QLocale,
    QMetaObject, QObject, QPoint, QRect,
    QSize, QTime, QUrl, Qt)
from PySide6.QtGui import (QBrush, QColor, QConicalGradient, QCursor,
    QFont, QFontDatabase, QGradient, QIcon,
    QImage, QKeySequence, QLinearGradient, QPainter,
    QPalette, QPixmap, QRadialGradient, QTransform)
from PySide6.QtWidgets import (QApplication, QMainWindow, QSizePolicy, QVBoxLayout,
    QWidget)

from PySide2extn.RoundProgressBar import roundProgressBar

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        if not MainWindow.objectName():
            MainWindow.setObjectName(u"MainWindow")
        MainWindow.resize(337, 313)
        self.centralwidget = QWidget(MainWindow)
        self.centralwidget.setObjectName(u"centralwidget")
        self.verticalLayout = QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName(u"verticalLayout")
        self.widget = roundProgressBar(self.centralwidget)
        self.widget.setObjectName(u"widget")
        self.widget.setMinimumSize(QSize(200, 200))
        self.widget.setMaximumSize(QSize(200, 200))

        self.verticalLayout.addWidget(self.widget, 0, Qt.AlignHCenter|Qt.AlignVCenter)

        MainWindow.setCentralWidget(self.centralwidget)

        self.retranslateUi(MainWindow)

        QMetaObject.connectSlotsByName(MainWindow)
    # setupUi

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QCoreApplication.translate("MainWindow", u"MainWindow", None))
    # retranslateUi

Исполняемый файл:

import sys

from ui_untitled import *


class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)

        self.ui.widget.rpb_setMaximumSize(200, 200)
        self.ui.widget.rpb_setMinimumSize(200, 200)
        self.ui.widget.rpb_setPathWidth(20)
        self.ui.widget.rpb_setLineWidth(10)
        self.ui.widget.rpb_setLineCap('RoundCap')
        self.ui.widget.rpb_setValue(30)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec())

Ошибка:

TypeError: 'PySide2.QtWidgets.QWidget' called with wrong argument types:
  PySide2.QtWidgets.QWidget(QWidget)
Supported signatures:
  PySide2.QtWidgets.QWidget(typing.Optional[PySide2.QtWidgets.QWidget] = None, PySide2.QtCore.Qt.WindowFlags = Default(Qt.WindowFlags))

Раньше все работало, но сейчас почему-то перестало :(

Документация PySide2extn: https://anjalp.github.io/PySide2extn/