Log not getting generated in /var/log/ on Debian

I've been running Unbound on FreeBSD for many years. Making a transition to Debian, and all seems to be working well except nsd.log does not seem to be generating in /var/log/ at all.

I've got this in nsd.conf:

         # log messages to file. Default to stderr and syslog (with
         # facility LOG_DAEMON). stderr disappears when daemon goes to bg.
         logfile: "/var/log/nsd.log"

Instead it seems to be piping to /var/log/syslog. How do I allow it to create and append its own independent log file?

TIA

FONG

Also noticed this error in /var/log/syslog:

[2020-07-27 22:11:21.512] nsd[31231]: warning: Cannot reopen /var/log/nsd.log for appending (Read-only file system), keeping old logfile

but I have made nsd.log user and group writable and owned it nsd:nsd.

Hello,

Please see
https://lists.nlnetlabs.nl/pipermail/nsd-users/2020-May/002863.html

Regards,
Simon