Error "... unhandled mode_state_template", root cause?

[Domoberry]

Hi All,
Busy trying to improve the implementation of the Zwave Eurotronic Spirit thermostat valve controller via ZwaveJS to Domoticz based on MQTT Auto discovery.
(for example: Domoticz UI allows to set the valve controller mode to 'cool', which is not supported by the device itself. Also pressing the 'boost' button on the controller throws an error in Domoticz).
Made practical progres but stumbled on this error:

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Error: Zwave AD: climate device unhandled mode_state_template

This seems to suggest that Domoticz MQTT Auto Discovery could not properly parse this line in the MQTT Auto Discovery config message:

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"mode_command_template": "{{ {'Off': 'off', 'Heat': 'heat', 'Eco Heat': 'energy_heat', 'Boost': 'full_power', 'Manual': 'manufacturer_specific' }[value] | default(value) }}"

Any suggestion is welcome!