Reference to non-existent files in output from 9.18 rndc zonestatus

I'm baffled by something strange I came across yesterday, and would
appreciate an injection of clue.

I've kept this message short. Of course I can give more detail, but
it's not yet clear what might be useful enough either to merit imposing
a longer message on readers' attention, or to justify the cost to me
of preparing one containing minute detail.

I was doing some housekeeping in preparation for upgrading a primary
authoritative nameserver currently running BIND9.18 on Ubuntu 22.04
to BIND9.20 on Ubuntu 24.04.

All of the zone and key data in the directory tree */etc/bind/dynamic/*
were relocated to */var/lib/bind/dynamic/* while **named** was stopped.
Corresponding changes were made to the configuration.

On restarting **named**, log messages seemed to indicate success, but
information displayed in response to `rndc zonestatus` referred to
files in */etc/bind/dynamic/*, which actually no longer existed.

Specifically, after **named** had logged the message

`zone foo.ie/IN: loaded serial 2022031967 (DNSSEC signed)`,

indicating that the zone must have been loaded from a file in
*/var/lib/bind/dynamic/foo.ie/* (as this was the only available source),
the response to `rndc zonestatus` included the line

`files: /etc/bind/dynamic/foo.ie/db.foo.ie`.

As I did not understand the significance of this anomaly, it seemed
prudent to revert to the prior configuration.

Thanks in anticipation,
Niall O'Reilly

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