Automation executed during startup gets unavailable

Hi All,

I have an automation which is triggered by homeassistant startup.
Unfortunately it seems that while the automation is executed it gets unavailable (as home assistant loads the automations integration during startup?).

Any idea what I am doing wrong here?

Automation looking like the following:

  - id: create_floor_groups_delay
    alias: 'create floor groups delay'
    description: 'delay execution of automation.create_floor_groups at HA startup'
    trigger:
      - platform: homeassistant
        event: start
    action:
      - delay: '00:00:15'
      - service: automation.trigger
        entity_id: 
          - automation.create_floor_groups

History and trace timeline shows that it gets unavailable during the execution:

2021-05-31_12-55-43