/usr/share/doc/fcitx-table-bingchan/changelog.Debian.gz is in fcitx-table-bingchan 1:4.2.9.6-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/fcitx-table-bingchan/../fcitx-modules/changelog.Debian.gz