debbisect
debbisect is a tool from devscripts to bisect using snapshot.d.o.
Example:
DEBIAN_BISECT_SRCPKG=mysrc debbisect "two years ago" yesterday /usr/share/doc/devscripts/examples/debbisect_buildsrc.sh
Sometimes building mmdebstrap customize-hook does not work as intended, sbuild can be useful: https://lists.debian.org/debian-ssh/2026/03/msg00008.html
More info in its manpage debbisect