Reinstall changes icecast.xml

Ubuntu 20.04.4
Icecast 2.4.4-3ubuntu0.1

    <authentication>
        <!-- Sources log in with username 'source' -->
        <source-password>PASSWORD-A</source-password>

        <!-- Relays log in with username 'relay' -->
        <relay-password>PASSWORD-B</relay-password>

        <!-- Admin logs in with the username given below -->
        <admin-user>username</admin-user>
        <admin-password>PASSWORD-C</admin-password>
    </authentication>

Then I do apt remove icecast2 and apt install icecast2.... The icecast.xml stays the same apart from:

    <authentication>
        <!-- Sources log in with username 'source' -->
        <source-password>PASSWORD-D</source-password>

        <!-- Relays log in with username 'relay' -->
        <relay-password>PASSWORD-D</relay-password>

        <!-- Admin logs in with the username given below -->
        <admin-user>username</admin-user>
        <admin-password>PASSWORD-D</admin-password>
    </authentication>

Are these passwords supposed to change on reinstall?  Where is it getting PASSWORD-D from, it's nowhere else in icecast.xml??

I noticed this when I updated from 18.04 to 20.04, which meant that icecast didn't work as expected after the update, but the same happens with uninstall / reinstall on 20.04.

This is unhelpful when updating

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