PyQt6嵌入Matplotlib带blitting的Cursor时的偏移与样式异常问题

我正在开发一款基于Python的光谱数据处理软件，采用PyQt6构建GUI、Matplotlib绘制数据。为简化数据选择，给坐标轴添加了Matplotlib的Cursor组件，并启用blitting模式以提升性能。

基础功能正常：鼠标移入坐标轴时光标显示，移出时隐藏，但鼠标移入时整个坐标轴内容会轻微偏移，有时图形边缘颜色还会从黑色变为灰色。

最小复现代码 #

# Import packages
from PyQt6.QtWidgets import QMainWindow, QApplication, QWidget, QVBoxLayout
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.widgets import Cursor
from matplotlib.figure import Figure
import numpy as np


# Main window
class MainWindow(QMainWindow):
    def __init__(self):
        # Initialize QMainWindow
        super().__init__()
        # Get MplWidget
        self.mpl_widget = MplWidget()
        # Set MplWidget as central widget
        self.setCentralWidget(self.mpl_widget)
        # Create axes
        self.ax = self.mpl_widget.canvas.figure.add_subplot(111)
        # Reference Cursor
        self.cursor = Cursor(self.ax, useblit=True)
        # Plot some random stuff
        x, y = np.random.rand(100), np.random.rand(100)
        self.ax.scatter(x, y)
        # Show app
        self.show()


# MplCanvas
class MplWidget(QWidget):
    def __init__(self, parent=None):
        # Initialize QWidget
        super().__init__(parent)
        # Create canvas
        self.canvas = FigureCanvas(Figure())
        # Set constrained layout
        self.canvas.figure.set_constrained_layout(True)
        # Create layout
        layout = QVBoxLayout()
        # Add canvas
        layout.addWidget(self.canvas)
        # Set layout
        self.setLayout(layout)


# Initialize app
app = QApplication([])
UI = MainWindow()
app.exec()

现象演示 #

最小示例现象：

实际应用现象：

请问如何解决该问题？

内容的提问来源于stack exchange，提问作者pypy22