ZBX self-monitoring template:

https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/app/zabbix_server/template_app_zabbix_server.yaml?at=refs%2Fheads%2Frelease%2F6.0

contains "trigger housekeeper" item, which seems to be not supported according to documentation:

https://www.zabbix.com/documentation/current/en/manual/config/items/itemtypes/internal

There are similar issues with older version:

https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/app/zabbix_server/template_app_zabbix_server.yaml?at=refs%2Fheads%2Frelease%2F5.4

containing following items not supported in version 5.4:

• trigger housekeeper
• service manager (v6.0)
• cluster discovery (v6.0)

according to doc.:

https://www.zabbix.com/documentation/5.4/en/manual/config/items/itemtypes/internal