Pyside2 QtWidgets.QPlainTextEdit.setPlainText() will crash, when is Non-ascii characters, such as gb18030 character set

read_fileobject = QFile("out.txt")
if not read_fileobject.open(QIODevice.WriteOnly | QIODevice.Text):
return

input_TextStream = QtCore.QTextStream(read_fileobject)
input_TextStream.setCodec("utf-8")
QtWidgets.QPlainTextEdit.setPlainText(input_TextStream.readAll())

this is QtWidgets.QPlainTextEdit.setPlainText(input_TextStream.readAll()). if text is ascii characters, ok.

if text is Non-ascii characters, such as gb18030 character set, app will crash.