Using Modbus cover entities in scenes

Configuration
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1

Hi there,
I’m using the following template to control about 20 rolling shutters at my place.

    covers:
      dachterrasse:
        friendly_name: "Dachterrasse"
        unique_id: "rollingshutter.roofdeck"
        device_class: shutter
        position_template: "{{ states('sensor.roofdeck_shutterposition') }}"
        open_cover:
          - service: script.impuls_on_coil
            data:
              address: 12400 #MW7.0
        close_cover:
          - service: script.impuls_on_coil
            data:
              address: 12401 #MW7.1
        stop_cover:
          - service: script.impuls_on_coil
            data:
              address: 12402 #MW7.2
        set_cover_position:
          service: script.set_cover_position
          data:
              position: "{{(position)}}"
              address: 12294 #MW6

Each shutter for its own is working properly, but if i put them into a scene to move them all at one time, some information get lost.
Filtering out the Modbus network traffic with wireshark leads to the problem: Home Assistant does not send all commands needed for the scene to the network. Between 10 and 15 commands are send, the others are missing.
Does anyone have an idea how to optimize the configuration to get all shutters working?

Thanks in advance