When deleting corrupted cached files through the web interface, apt-cacher-ng requires the conf/delconfirm.html file, which is not installed by the ebuild. Several other mirrors lists from conf are also not installed. Reproducible: Always
Ebuilds before version 0.6.11 installed a hard-coded list of files in conf/. With 0.6.11, a glob is used instead to simply install everything that is found there.