SmartThings Zigbee Plug not showing power (Z2M)

Quite a lot of posts on this but still no solution.

Using the Z2M (and ZHA I believe) the power entity does not get updated, pressing synch in MQTT updates as does publishing a message to MQTT. All very curious.

action: mqtt.publish
data:
  evaluate_payload: true
  qos: 0
  retain: false
  topic: zigbee2mqtt/Boiler Room Plug/get
  payload: " {\"power\": \"\"}"

Are the power entities there, or enabled, in the integrations panel where the entity configuration lives?
Open your Home Assistant instance and show your integrations.

Yes, present and enabled

That looks to be updating by the numbers.

If you look, the plug is switched off! Previously the power was updated as explained in my post.