Thanks @cluhmann. Sorry for the wrong title. In fact I did use 4.0.0b4 above. If this error is reproducible and not just an issue on my end then I will put this on GitHub.
Thanks @cluhmann. Sorry for the wrong title. In fact I did use 4.0.0b4 above. If this error is reproducible and not just an issue on my end then I will put this on GitHub.