pfsense-zabbix-template: Not supported by Zabbix Agent

Getting the following error with the Discovery rules and with some of the items, specifically any that have the pfsense.value key set. Not supported by Zabbix Agent

I’m running a pfsense+ appliance from NetGate .

21.05.2-RELEASE (amd64)
built on Fri Oct 22 15:24:02 UTC 2021
FreeBSD 12.2-STABLE

I am running Zabbix 5.0.19 and I’ve tried both agent packages (5.0.11 and 5.4.2).