Determine propane heater time on

Configuration
1

This was working working till a recent HA up date. Any ideas would be appreciated. Thanks in advance. It’s showing “entity not available”

- platform: history_stats
    name: propane on today
    entity_id: binary_sensor.propane_heater_on_time
    state: "on"
    type: time
    start: "{{ now().replace(hour=0).replace(minute=15).replace(second=0) }}"
    end: "{{ now() }}"

  - platform: trend
    sensors:
     indoor_temp_rising:
       entity_id: sensor.propane_heater_temp
       sample_duration: 3600
       max_samples: 120
       min_gradient: 0.0011
       device_class: heat