/usr/share/doc/libloadpng4-dev/CHANGES.gz is in libloadpng4-dev 2:4.4.2-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libloadpng4-dev/changelog.gz
/usr/share/doc/libloadpng4-dev/changelog.gz