Ikea Tradfi bulb always publishes 2 identical messages 3 seconds apart

Hello all,
I noticed that Zigbee2mqtt always publishes two identical status messages three seconds apart for my Ikea Tradfi bulb. This is not really a problem, I am just wondering why and if it is possible to prevent the second identical to unclutter the traffic a little bit.
Using the debounce switch in the device configuration did not help.
I assume that it’s the bulb that triggers these messages every 5 minutes?

info  2020-02-10 09:20:52: MQTT publish: topic 'zigbee2mqtt/ikeabulb01', payload '{"state":"OFF","linkquality":0,"brightness":254,"last_seen":"2020-02-10T09:20:51+01:00"}'
info  2020-02-10 09:20:55: MQTT publish: topic 'zigbee2mqtt/ikeabulb01', payload '{"state":"OFF","linkquality":0,"brightness":254,"last_seen":"2020-02-10T09:20:54+01:00"}'

Relevant lines from configuration.yaml:

homeassistant: false
  base_topic: zigbee2mqtt
  include_device_information: false
  cache_state: true
  report: true
devices: devices.yaml 

Relevant lines from devices.yaml:

  friendly_name: ikeabulb01
  debounce: 1