Shelly 3EM 3-phase Net Metering templates for export not working

I am trying to customize the energy dashboard to show my consumed power, generated solar power and the power that was fed back into the grid.

I found the following templates which should do exactly the things above:
https://community.home-assistant.io/t/shelly-3em-3-phase-net-metering-templates-for-import-export-and-consumption/390237

I copied the templates into my config and modified the sensor sources:

- platform: template
  sensors:
    # Gaszähler, kommend von ESPHome, aufbereiten für Energy
    gasincubicmeter:
      unique_id: gas_qubic_meter
      value_template: "{{ states('sensor.gasverbrauch') | float }}"
      unit_of_measurement: m³
      device_class: gas
      attribute_templates:
        state_class: total_increasing
    # Template sensor for values of power import (active_power > 0)
    power_import:
      friendly_name: "Power Import"
      unit_of_measurement: "W"
      value_template: >-
        {% if (states('sensor.hausverbrauch_channel_a_power')|float + states('sensor.hausverbrauch_channel_b_power')|float + states('sensor.hausverbrauch_channel_c_power')|float) > 0 %}
          {{ states('sensor.hausverbrauch_channel_a_power')|float + states('sensor.hausverbrauch_channel_b_power')|float + states('sensor.hausverbrauch_channel_c_power')|float }}
        {% else %}
          {{ 0 }}
        {% endif %}
      availability_template: "{{
        [ states('sensor.hausverbrauch_channel_a_power'),
        states('sensor.hausverbrauch_channel_b_power'),
        states('sensor.hausverbrauch_channel_c_power')
        ] | map('is_number') | min
        }}"
    power_export:
      friendly_name: "Power Export"
      unit_of_measurement: "W"
      value_template: >-
        {% if (states('sensor.hausverbrauch_channel_a_power')|float + states('sensor.hausverbrauch_channel_b_power')|float + states('sensor.hausverbrauch_channel_c_power')|float) < 0 %}
          {{ (states('sensor.hausverbrauch_channel_a_power')|float + states('sensor.hausverbrauch_channel_b_power')|float + states('sensor.hausverbrauch_channel_c_power')|float) * -1 }}
        {% else %}
          {{ 0 }}
        {% endif %}
      availability_template: "{{
        [ states('sensor.hausverbrauch_channel_a_power'),
        states('sensor.hausverbrauch_channel_b_power'),
        states('sensor.hausverbrauch_channel_c_power')
        ] | map('is_number') | min
        }}"
# Sensor for Riemann sum of energy import (W -> Wh)
- platform: integration
  source: sensor.power_import
  name: energy_import_sum
  unit_prefix: k
  round: 1
  method: left

# Sensor for Riemann sum of energy export (W -> Wh)
- platform: integration
  source: sensor.power_export
  name: energy_export_sum_new
  unit_prefix: k
  round: 1
  method: left

also the utility meters


utility_meter:
  gasverbrauch_daily:
    source: sensor.gasverbrauch
    cycle: daily
  energy_export_daily:
    source: sensor.energy_export_sum_new
    name: Energy Export Daily
    cycle: daily
  energy_import_daily:
    source: sensor.energy_import_sum
    name: Energy Import Daily
    cycle: daily
  energy_import_monthly:
    source: sensor.energy_import_sum
    name: Energy Import Monthly
    cycle: monthly
  energy_export_monthly:
    source: sensor.energy_export_sum_new
    name: Energy Export Monthly
    cycle: monthly

restarted homeassistant, and all the sensors show up in entities.

But now the weird part, the Power Import sensor is working and showing current readings, also the energy_import_sum sensor is filled correctly and i can see the history of it, and also the utility meter “energy_import_daily” is working and showing the calculated values.

BUT the “Power Export” is behaving differently. While the “Power Export” Sensor is showing the values as expected

but the other two “energy_export_sum_new” and “energy_export_daily” do not show any data and seem to not be updated (last updated 9 hours ago while Power Export was fired recently)

I don’t understand what is going wrong here, why is import working and export not?
Any help is welcome