/usr/share/doc/gir1.2-json-1.0/changelog.Debian.gz is in gir1.2-json-1.0 1.1.2-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gir1.2-json-1.0/../libjson-glib-1.0-0/changelog.Debian.gz