HASS.Agent fails to start the first time when Home Assistant is restarted

[danielbrunt57]

Logger: homeassistant.config_entries
Source: config_entries.py:504
First occurred: 4:03:26 AM (1 occurrences)
Last logged: 4:03:26 AM

Error setting up entry WINDOWS-11 for hass_agent
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/mqtt/client.py", line 180, in async_subscribe
    mqtt_data = get_mqtt_data(hass)
                ^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/mqtt/util.py", line 179, in get_mqtt_data
    mqtt_data = hass.data[DATA_MQTT]
                ~~~~~~~~~^^^^^^^^^^^
KeyError: 'mqtt'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 504, in async_setup
    result = await component.async_setup_entry(hass, self)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/hass_agent/__init__.py", line 162, in async_setup_entry
    await async_subscribe_topics(hass, sub_state)
  File "/usr/src/homeassistant/homeassistant/components/mqtt/subscription.py", line 132, in async_subscribe_topics
    await sub.subscribe()
  File "/usr/src/homeassistant/homeassistant/components/mqtt/subscription.py", line 61, in subscribe
    self.unsubscribe_callback = await self.subscribe_task
                                ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/mqtt/client.py", line 182, in async_subscribe
    raise HomeAssistantError(
homeassistant.exceptions.HomeAssistantError: Cannot subscribe to topic 'hass.agent/devices/WINDOWS-11', make sure MQTT is set up correctly

Reload integration...

And it works...

So the issue appears to be the timing of integrations loading...