/usr/share/doc/libcitadel4-dbg/changelog.Debian.gz is in libcitadel4-dbg 8.24-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libcitadel4-dbg/../libcitadel4/changelog.Debian.gz
/usr/share/doc/libcitadel4-dbg/../libcitadel4/changelog.Debian.gz