Man pages not being installed in python docker image

I am trying to extend a python docker image by installing some apt packages. However, I'm running into problems related to missing manual pages. Man pages don't seem to be getting installed (even with man-db installed).

If I run the following:

docker run -it python:3.9-slim@sha256:2c018e29a8eada75e855d78641adda978a2c0a035fd928e281e1240144e8a337 /bin/bash
apt-get update
apt-get install -y man-db
apt-get install -y zzuf

dpkg claims that it has installed some man pages (at least -L links them)

> dpkg -L zzuf | grep man1
/usr/share/man/man1
/usr/share/man/man1/zzat.1.gz
/usr/share/man/man1/zzuf.1.gz

But they don't seem to actually be installed (and /usr/share/man is empty)

> ls /usr/share/man

Why is this happening and how do I get manual pages to be installed?

Feedback

How to install man pages on an ubuntu docker image? is addressing a problem with the same cause: dpkg can be configured to not install files matching certain packages.

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