Average between two sensors not working

Hi,
I have two AEOTEC multisensor in the same room and would like to average their temperature.
The problem is that the only temperature reported in the average is the one of sensor.multisensor_livingroom_air_temperature

The two values are very close (23.1 and 23.3), but I don’t see why the average shouldn’t be 23.2…

Here’s my code:

sensor:
  - platform: min_max
    name: "Livingroom average temperature"
    type: mean
    round_digits: 1
    entity_ids:
      - sensor.multisensor_livingroom_air_temperature
      - sensor.multisensor_entrance_air_temperature

change Sensor: to sensor: and try

It’s actually already sensor with lower case, I just typed it wrong in the form sorry

I guess it’s just a matter of decimals… could it be?