The current official template F5 Big-IP by SNMP is designed to work with TMOS-based devices

.1.3.6.1.4.1.3375

F5 BIG-IP rSeries platforms operate on F5OS, which some metrics under a different enterprise OID

.1.3.6.1.4.1.12276

As a result, the official template cannot working on rSeries.

It should also be clearly stated in the template documentation that the F5 BIG-IP rSeries is not currently supported.
https://www.zabbix.com/jp/integrations/f5

References:
https://www.f5.com/products/big-ip-services/rseries-adc-hardware-appliance
https://clouddocs.f5.com/training/community/rseries-training/html/rseries_monitoring_snmp.html