customize.yaml not applied until entity is edited via UI — inconsistent refresh behavior

[nbjsnb]

The problem

The problem

When customizing entity attributes using customize.yaml, the changes do not take effect — even after clicking “Reload Location & Customizations” or restarting Home Assistant Core.

However, if I go into the UI and edit the entity manually (e.g. change the friendly_name), then suddenly the settings in customize.yaml get applied.

This behavior is confusing and inconsistent. It seems the entity registry does not always refresh or re-apply customizations unless touched via UI.

What version of Home Assistant are you running?

core-2025.7.0

Steps to reproduce

1. Add a valid customization to customize.yaml, e.g.:

sensor.xiaomi_cn_899825387_rrar00_compressor_frequency_p_12_11:
  friendly_name: compressor_frequency
  state_class: measurement
  device_class: duration
  unit_of_measurement: Hz

2.Click "Reload location & customizations" or restart Home Assistant

3.Nothing changes

4.Go to UI → Edit entity → Modify anything → Save

5.Suddenly the customization is applied

What version of Home Assistant Core has the issue?

core-2025.7.0

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

No response

Link to integration documentation on our website

No response

Diagnostics information

No response

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

No response

[Petro31]

The intentions of customize.yaml are not meant to be used in combination with the UI because the UI overwrites the customizations. Typically a restart is what you have to do when an entity can be edible in both.

Sidebar: The device_class and unit_of_measurement that you chose on that entity clash, which can lead to problems. https://www.home-assistant.io/integrations/sensor/