Control: found -1 javascript-common/11+nmu1
Control: tags -1 = confirmed
Control: severity -1 serious
Here's a scripted reproducer:
mmdebstrap --variant=apt --chrooted-customize-hook='cd / && apt download javascript-common && dpkg
-i ./javascript-common_*.deb && rm /etc/apache2/conf-available/javascript-common.conf && apt install -y
apache2 && dpkg -i ./javascript-common_*.deb' stable /dev/null
I'll note this already happens with the version in stable.
Raising severity to serious, as per my understanding of the policy,
removing a conffile is a supported action, and maintainer scripts
must not fail in this case.
A workaround should be:
dpkg -i --reinstall ./javascript-common_*.deb
(Which should restore the missing conffiles.)
Chris