Group of sensors with power / energy and utility meter

I created 2 groups in groups.yaml:

sensor_power_entities:
  name: Power
  entities:
    - sensor.hvac_power
    - sensor.heating_power

sensor_energy_entities:
  name: Energy
  entities:
    - sensor.hvac_energy
    - sensor.heating_energy

In the UI group.sensor_power_entities show the current consumption in W.
But group.sensor_energy_entities shows ‘Unknown’. Why ?

My final goal is to have a utility meter for this group like this:

utility_meter:
  sensor_energy_entities_day:
    source: group.sensor_energy_entities
    cycle: daily

What I’m I doing wrong?
Why is ‘groups’ able to calculate consumption in W (power), but not in kWh (energy)?
Is there a workaround?
My group in the example above only contains 2 sensors, but actually contains over 40 sensors (all reporting data on each individual sensor, both power and energy)

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Did you ever figure this out?