Sensor states at HA restart?

@klogg wrote:

I have two sensors for measuring outside light levels. One 100% reliable but not always accurate, the other not always reliable but very accurate.

I have automations switch to using the 100% reliable but less accurate sensor any time the other one isn’t available.

So, I decide if a room is dark based on the current sensor but every time HA restarts its state always goes to ‘on’. Why is that and can I stop it? Here is the sensor.

      dark_hall:
        friendly_name: Dark in the hall
        entity_id:
          - sensor.smartweather_average_illuminance
          - sensor.brightness
          - input_number.hall_smartweather_average_illuminance_sensor_threshold
          - input_number.hall_brightness_sensor_threshold
          - input_select.sensor_for_darkness
        value_template: >
          {% set sensor_threshold = states('input_number.hall_' + states('input_select.sensor_for_darkness') + '_sensor_threshold') | int %}
          {% set sensor_used = states('input_select.sensor_for_darkness') %}

          {{ states('sensor.' + sensor_used) | int <= sensor_threshold }}

I would have expected it to remember its state from before the restart but it doesn’t. Is that because it is a template sensor?

The only way I can think of doing this is by changing my state triggers to include a for:

  - alias: Hall Lights On When It Gets Dark
    trigger:
      #=== If it is dark
      - platform: state
        entity_id: binary_sensor.dark_hall
        from: 'off'
        to: 'on'
        for:
          seconds: 30

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