Subclass of `QRunnable` crash when it try to emit a signal

from PySide2.QtWidgets import *
from PySide2.QtCore import *
import sys


class MyRunnable(QRunnable, QObject):
    done = Signal(str)

    def __init__(self, parent=None):
        super(MyRunnable, self).__init__(parent)

    def run(self):
        print(f"{self} run.")
        i=0
        while i<4:
            QThread.currentThread().sleep(1)
            print(f"while {i}<4")
            i += 1
        self.done.emit("hahahaha")


class MyObject(QObject):
    def __init__(self, parent=None):
        super().__init__(parent)
        long_time_operator = MyRunnable()
        long_time_operator.setAutoDelete(True)
        #long_time_operator.done.connect(self.onDone, Qt.ConnectionType.QueuedConnection)
        long_time_operator.done.connect(self.onDone)
        QThreadPool.globalInstance().start(long_time_operator)

    @Slot(str)
    def onDone(self, haha):
        print(f"Received:{haha}")


if __name__ == '__main__':
    app = QApplication(sys.argv)
    my_object = MyObject()
    sys.exit(app.exec_())

<__main__.MyRunnable object at 0x0000018668838588> run.
while 0<4
while 1<4
while 2<4
while 3<4

Process finished with exit code -1073741819 (0xC0000005)