sensor 'time_1_sec' has incorrect trigger setup

[vl-pub]

why sensor (system_sensors.yaml)

  - trigger:
      - platform: time_pattern
        seconds: "/30"
    sensor:
      - name: time_1_sec
        state: '{{ as_timestamp(now()) | round(default=0)}}'

has trigger 'seconds: "/30"' ??
it works wrong

it should use 'seconds: "/1"' to be changed each second