Why does HTTPd do this?

apt-wrapper.sh

#!/bin/sh
set -e

apt update
DEBIAN_FRONTEND=noninteractive apt "$@"
apt clean
apt autoremove -y
rm -rf /var/log/{alternatives.log,apt,dpkg.log}
rm -rf /var/cache/apt
rm -rf /var/lib/apt/lists

default.conf

<VirtualHost *:80 *:443>
	ServerName test
	DocumentRoot "/var/www/html"
</VirtualHost>

<Directory "/var/www/html/">
	Options FollowSymLinks
	AllowOverride All
	<FilesMatch "foo">
		RewriteEngine On
		RewriteRule .* - [F]
	</FilesMatch>
</Directory>

default.html

This is default.

Dockerfile

FROM ubuntu:18.04

COPY ./apt-wrapper.sh /tmp/apt
RUN chmod +x /tmp/apt

RUN /tmp/apt install -y --no-install-recommends apache2='2.4.*'

RUN a2enmod rewrite
RUN a2dissite 000-default

RUN sed -e '/^*)/ { n; s/$HTTPD/exec &/; }' -i /usr/sbin/apache2ctl
ENTRYPOINT [ "apache2ctl" ]
CMD [ "-DFOREGROUND" ]
EXPOSE 80

COPY ./default.conf /etc/apache2/sites-available/default.conf
RUN a2ensite default

RUN rm /var/www/html/index.*
COPY ./htaccess /var/www/html/.htaccess
COPY ./*.html /var/www/html/

htaccess

RewriteEngine on
RewriteRule ^(foo|bar)$ /default.html [L]
RewriteRule ^baz$ /foobar [L]

index.html

<a href="bar">bar</a> - should work and does<br/>
<a href="foo">foo</a> - should work, but doesn't<br/>
<a href="baz">baz</a> - shouldn't work and doesn't<br/>