Thank you. I assumed whatever needs to be there would be put back automatically (I don’t remember seeing the minute-timer version originally but could well be wrong).
I have an other system running and that has not been upgraded - still on 15.0.63
So I have copied back the cron line from there.
* * * * * [ -e /usr/sbin/fwconsole ] && sleep $((RANDOM\%30)) && /usr/sbin/fwconsole job --run --quiet 2>&1 > /dev/null