Initial_state: 'on' works in automation component but not in customizer

This works

automation notify_connectivity:
  initial_state: 'on'
  alias: notify_connectivity

but this doesn’t

  customize_domain:
    automation:
      initial_state: 'on'

they look the same on the state page

automation.dahua_off off last_triggered: 2019-03-20T20:51:05.018717+00:00 friendly_name: dahua_off initial_state: on
automation.notify_connectivity on last_triggered: null friendly_name: notify_connectivity initial_state: on