QMediaPlayer does not allow negative playback rate hence no rewinding possible

Our documentation says "Values less than zero can be set and indicate the media should rewind at the multiplier of the standard pace":
https://doc.qt.io/qt-6/qmediaplayer.html#playbackRate-prop

But it is not true after I test our Media Player Example. I add the following line to "PlayerControls::PlayerContorls":

m_rateBox->addItem("-1.0x", QVariant(-1.0));

in order to test play back. As soon as I select it, an assertion failed:

ASSERT: "playbackRate > 0.f" in file C:\Users\qt\work\qt\qtmultimedia\src\plugins\multimedia\ffmpeg\playbackengine\qffmpegtimecontroller.cpp, line 30