File in .deb file, but not installed

Binary package hint: libapache2-mod-authnz-external

Today when I installed libapache2-mod-auth-external, and tried to enable it, there was no .load or .conf file in /etc/apache2/mods-available. I did a dpkg -L on the package, and it listed:

/etc
/etc/apache2
/etc/apache2/mods-available
/etc/apache2/mods-available/authnz_external.load

But:

# ls -la /etc/apache2/mods-available/authnz_external.load
ls: cannot access /etc/apache2/mods-available/authnz_external.load: No such file or directory

I looked at the actual deb file, and it is in there (I copied it out into the mods-available directory).

I uninstalled and reinstalled the package, and the .load file still was not there.

Very weird, I've never seen a .deb do this before.