Setting

zabbixAgent:
  env:
    - name: ZBX_PASSIVE_ALLOW
      value: false

will render the liveness probes and service created by the helm chart useless, and actively shut down/restart working agents.

I've made an attempt to correct this; https://github.com/eb4x/zabbix-helm/commit/b48ebc839b9e7b1287ddd7b4e332106a3520bc92