byzanz's upstream git repository has been moved to
https://gitlab.gnome.org/Archive/byzanz and archived. This means that it
no longer accepts issue reports or merge requests, even if a serious
problem is found.

If someone is still maintaining it, then they will need to fork the
previous project and become its new upstream maintainer.

There is one package in Debian that depends on it:
deepin-screen-recorder.

    smcv