/usr/share/doc/libapache2-mod-mapcache/changelog.Debian.gz is in libapache2-mod-mapcache 1.4.0-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libapache2-mod-mapcache/../libmapcache1/changelog.Debian.gz