/usr/share/man/man1/xx-p4-unmerge.1.gz is in xxdiff-scripts 1:4.0.1+dfsg-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/xxdiff-scripts.1.gz
/usr/share/man/man1/xxdiff-scripts.1.gz