Sonoff Zigbee SNZB-02 mqtt

Configuration
2

Try

sensor:
- platform: mqtt
    name: "Temperature"
    unit_of_measurement: '°C'
    unique_id: "m_temperature" 
    device_class: temperature
    qos: 1
    state_topic: "tele/tasmota_D9B52C/3D3B/SENSOR"
    value_template: > 
     {% if "Temperature" in value_json["0x3D3B"] %} 
        {{ value_json["0x3D3B"]["Temperature"] }}
     {% else %}
       {{states('sensor.temperature') }}
    {% endif %}

- platform: mqtt
    name: "Humidity"
    unit_of_measurement: '%'
    unique_id: "m_humidity" 
    device_class: humidity
    qos: 1
    state_topic: "tele/tasmota_D9B52C/3D3B/SENSOR"
    value_template: >
     {% if "Humidity" in value_json["0x3D3B"] %} 
          {{ value_json["0x3D3B"]["Humidity"] }}
     {% else %}
       {{states('sensor.humidity') }}
    {% endif %}