Bookworm SNMP daemon not extending.

Been trying to set up SNMPD  on my raspberry PI and simply cannot get the 'extend' feature working
Everything else checks out as expected..but adding
extend cputemp  /usr/local/scripts/thermometer ""
extend disktemps /usr/local/scripts/disk-temperatures ""
extend hi /usr/bin/echo "Hello world"
to snmpd.conf results in no output in snmpwalk
Is it possible that the extend function is disabled in the latest Raspios Bookworm?
If so, how to re-enable?
How to check?
Systemd has made finding relevant logging impossible. journalctl reveals nothing of relevance
--
“Politics is the art of looking for trouble, finding it everywhere, diagnosing it incorrectly and applying the wrong remedies.”
― Groucho Marx