Template sensor showing "unknown"

Configuration
12

That template isn’t going to achieve anything, but I’m not sure what your end goal is either.

If you want to track every weight that is below 80 on one entity, and every weight that is above (or equal to 80) on another entity, this would be one option:

  - trigger:
      - platform: state
        entity_id: sensor.bluetooth_proxy_miscale_weight
        not_to: 
          - unavailable
          - unknown
        variables:
          threshold: 80
    sensor:
      - name: Weight Eq and Above Threshold
        unique_id: f700e52a-1304-4d47-8bea-5b2c8f4049fe
        unit_of_measurement: kg
        device_class: weight
        state: >
          {{ trigger.to_state.state if trigger.to_state.state | float(0) >= threshold else this.state }}
      - name: Weight Below Threshold
        unique_id: 42e1e5c9-1476-4e8d-9e8d-9071021ebb4b
        unit_of_measurement: kg
        device_class: weight
        state: >
          {{ trigger.to_state.state if trigger.to_state.state | float(0) < threshold else this.state }}