Debian (as well as Fedora) currently have a broken policy of switching Rust dependencies to system packages - which are frequently out of date, and cause real breakage.
As a result, updates that fix multiple critical bugs aren't getting packaged. (Beyond that, Debian is for some reason shipping a truly ancient bcachefs-tools in stable, for reasons I still cannot fathom, which I've gotten multiple bug reports over as well). If you're running bcachefs, you'll want to be on a more modern distro - or building bcachefs-tools yourself. If you are building bcachefs-tools yourself, be aware that the mount helper does not get run unless you install it into /usr (not /usr/local).
