Qt.Orientation used in combination with Property causes crash

from PySide6.QtCore import QSize, Qt, Property
from PySide6.QtWidgets import QWidget, QGridLayout, QTextEdit, QApplication, QSizePolicy


class Line(QWidget):
    _polishRecursionGuard = False
    _thickness = 0
    _orientation = Qt.Orientation(0)

    def __init__(self, orientation=Qt.Orientation.Horizontal, thickness=1, parent=None, **kwargs):
        super().__init__(parent, **kwargs)
        self.orientation = orientation
        self.thickness = thickness
        self.setAttribute(Qt.WA_StyledBackground, True)

    @Property(Qt.Orientation)
    def orientation(self):
        return self._orientation

    @orientation.setter
    def orientation(self, orientation):
        if self._orientation != orientation:
            self._orientation = orientation
            if orientation == Qt.Orientation.Horizontal:
                self.setSizePolicy(QSizePolicy.Policy.Preferred, QSizePolicy.Policy.Fixed)
            else:
                self.setSizePolicy(QSizePolicy.Policy.Fixed, QSizePolicy.Policy.Preferred)
            self.updateGeometry()
            self._polish()

    @Property(int)
    def thickness(self):
        return self._thickness

    @thickness.setter
    def thickness(self, size):
        if size < 1:
            return
        if self._thickness != size:
            self._thickness = size
            self.updateGeometry()
            self._polish()

    def _polish(self):
        if not self._polishRecursionGuard:
            self._polishRecursionGuard = True
            self.style().unpolish(self)
            self.style().polish(self)
            self._polishRecursionGuard = False

    def minimumSizeHint(self):
        return self.sizeHint()

    def sizeHint(self):
        if self._orientation == Qt.Orientation.Horizontal:
            return QSize(1, self._thickness)
        return QSize(self._thickness, 1)


app = QApplication([])
app.setStyleSheet('''
    Line[orientation=Horizontal] {
        background: orange;
        qproperty-thickness: 4;
    }
    Line[orientation=Vertical] {
        background: green;
        qproperty-thickness: 12;
    }
    Line#topSeparator {
        qproperty-orientation: Vertical;
    }
''')

test = QWidget()
l = QGridLayout(test)

l.addWidget(QTextEdit())
l.addWidget(Line(objectName='topSeparator'), 0, 1)
l.addWidget(QTextEdit(), 0, 2)
l.addWidget(Line(objectName='midSeparator'), 1, 0, 1, 3)
l.addWidget(QTextEdit(), 2, 0, 1, 3)
test.show()
app.exec()