Ошибка QPaintDevice: Cannot destroy paint device that is being painted в PyQt6 и PySide6

from PyQt5 import QtGui, QtWidgets
from PyQt5.QtCore import Qt
 
 
class MainWindow(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        self.label = QtWidgets.QLabel()
        canvas = QtGui.QPixmap(400, 300)
        canvas.fill(Qt.white)
        self.label.setPixmap(canvas)
        self.setCentralWidget(self.label)
        self.draw_something()
    
    def draw_something(self):
        painter = QtGui.QPainter(self.label.pixmap())    # [1]
        painter.drawLine(10, 10, 300, 200)
        painter.end()
 
 
app = QtWidgets.QApplication()
window = MainWindow()
window.show()
app.exec()

import sys
from PyQt6.QtWidgets import QApplication, QLabel, QMainWindow
from PyQt6.QtGui import QPainter, QPixmap
from PyQt6.QtCore import Qt
class MainWindow(QMainWindow):
  def __init__(self):
    super().__init__()
    self.label = QLabel()
    canvas = QPixmap(400, 300)
    canvas.fill(Qt.GlobalColor.white)
    self.label.setPixmap(canvas)
    self.setCentralWidget(self.label)
    self.draw_something()    
  def draw_something(self):
    pixmap = self.label.pixmap()
    painter = QPainter()
    painter.begin(pixmap)    # [1]
    painter.drawLine(10, 10, 300, 200)
    painter.end()
    self.label.setPixmap(pixmap)
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec())

  def draw_something(self):
    pixmap = self.label.pixmap()
    painter = QPainter(pixmap)
    painter.drawLine(10, 10, 300, 200)
    painter.end()
    self.label.setPixmap(pixmap)