core: Plugwise: KeyError: 'setpoint'

The problem

seeing below error in logs after updating to September beta and restarting consistently

number.opentherm_domestic_hot_water_setpoint no longer being available

What version of Home Assistant Core has the issue?

2023.9 beta 0

What was the last working version of Home Assistant Core?

2023.8.4

What type of installation are you running?

Home Assistant OS

Integration causing the issue

Plugwise

Link to integration documentation on our website

https://rc.home-assistant.io/integrations/plugwise/

Diagnostics information

config_entry-plugwise-474a410dc55f45ad8124f87f62baa412.json.txt

Example YAML snippet

No response

Anything in the logs that might be useful for us?

Logger: homeassistant.components.number
Source: components/plugwise/number.py:107 
Integration: Nummer (documentation, issues) 
First occurred: 08:11:33 (2 occurrences) 
Last logged: 08:11:33

Error adding entities for domain number with platform plugwise
Error while setting up plugwise platform for number
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 507, in async_add_entities
    await asyncio.gather(*tasks)
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 752, in _async_add_entity
    await entity.add_to_platform_finish()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 989, in add_to_platform_finish
    await self.async_added_to_hass()
  File "/usr/src/homeassistant/homeassistant/components/plugwise/entity.py", line 81, in async_added_to_hass
    self._handle_coordinator_update()
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 473, in _handle_coordinator_update
    self.async_write_ha_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 726, in async_write_ha_state
    self._async_write_ha_state()
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 826, in _async_write_ha_state
    state, attr = self._async_generate_attributes()
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 767, in _async_generate_attributes
    state = self._stringify_state(available)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 732, in _stringify_state
    if (state := self.state) is None:
                 ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/number/__init__.py", line 320, in state
    return self.value
           ^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/number/__init__.py", line 358, in value
    if (native_value := self.native_value) is None:
                        ^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/plugwise/number.py", line 107, in native_value
    return self.device[self.entity_description.key]["setpoint"]
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
KeyError: 'setpoint'

Additional information