MQTT Configuration Bug?-- Constant Spinning circle when trying to Validate--- I have attached the section of my configuration causing the issue

Did you ever have any luck with this? I am experiencing a similar error when trying to configure a MQTT sensor and I am on 2022.11.3. Validation just spins and if I try to use developer tools to reload MQTT entities I get “Failed to call service mqtt/reload. ‘list’ object has no attribute ‘get’”. Then if I try to reload other types of entities (such as Template) I get a similar error message “Failed to call service template/reload. ‘list’ object has no attribute ‘get’”.

This is my sensor definition (lives in packages):

    - state_topic: "homeassistant/custom_devices/kitchen_scene_controller/button"
      unique_id: kitchen_scene_controller_button
      name: "Kitchen Scene Controller Button"
      qos: 0
      retain: false

Your question made me look into this again and I ended up resolving it on my end. For my situation the answer can be found here:

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