ZHA: insecure Zigbee2MQTT network key

Configuration Zigbee
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I set up a Zigbee network using ZHA and my logs show this warning:

Your network is using the insecure Zigbee2MQTT network key!
  • I am not using Zigbee2MQTT and never installed it, I use ZHA. Why is there a Zigbee2MQTT error?
  • How can I display my network key to check what I am using?
  • If my installation uses a default key, how can I change it?
  • Why would ZHA use an unsecured default key instead of generating one?
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Thank you, I already saw this post, but it doesn’t answer my questions.