Thermostat card: hvac_action does not update to idle on UI and Developer Tools->States

Checklist

[X] I have updated to the latest available Home Assistant version.
[X] I have cleared the cache of my browser.
[X] I have tried a different browser to see if it is related to my browser.
[ ] I have tried reproducing the issue in safe mode to rule out problems with unsupported custom resources.

Describe the issue you are experiencing

Thermostat card doesn't update hvac_action to idle even if REST API call shows that the generic thermostat is in idle hvac_action. The Developer Tools->States also shows the wrong hvac_action information.

Describe the behavior you expected

When hvac_action is set to The heat control works fine though (the switch turns off when current_temp>target_temp+hot_tolerance

Steps to reproduce the issue

(ha_venv3_12) pi@raspberrypi:~/homeassistant_conf $grep -v "#" climate.yaml
- platform: generic_thermostat
  name: B3_heat
  heater: switch.shelly1_b3_heat
  target_sensor: sensor.main_temp_template
  min_temp: 18
  max_temp: 23
  precision: 0.1
(ha_venv3_12) pi@raspberrypi:~/homeassistant_conf $curl -H @hass_header.txt http://localhost:8123/api/states/switch.shelly1_b3_heat
{"entity_id":"switch.shelly1_b3_heat","state":"off","attributes":{"friendly_name":"shelly1-349454724E19"},"last_changed":"2024-03-07T13:33:38.578557+00:00","last_updated":"2024-03-07T13:33:38.578557+00:00","context":{"id":"01HRCHX5CJ9FGEJASDYDCEJ0M7","parent_id":null,"user_id":null}}(ha_venv3_12) pi@raspberrypi:~/homeassistant_conf $
(ha_venv3_12) pi@raspberrypi:~/homeassistant_conf $curl -H @hass_header.txt http://localhost:8123/api/states/climate.b3_heat
{"entity_id":"climate.b3_heat","state":"heat","attributes":{"hvac_modes":["heat","off"],"min_temp":18.0,"max_temp":23.0,"target_temp_step":0.1,"current_temperature":22.3,"temperature":21.5,"hvac_action":"idle","friendly_name":"B3_heat","supported_features":385},"last_changed":"2024-03-07T13:37:00.043704+00:00","last_updated":"2024-03-07T13:37:00.043704+00:00","context":{"id":"01HRCJ3A49EYS9MWFQNVE3YBMT","parent_id":null,"user_id":"c554239d69374adb9ff0e3d31a9de214"}}(ha_venv3_12) pi@raspberrypi:~/homeassistant_conf $

b3_heat

What version of Home Assistant Core has the issue?

2024.2.5, 2024.3.0

What was the last working version of Home Assistant Core?

was working before, I have no version information though

In which browser are you experiencing the issue with?

Google Chrome 122.0.6261.96

Which operating system are you using to run this browser?

Windows 10 64 bit

State of relevant entities

See the 'Steps to reproduce' section

Problem-relevant frontend configuration

(ha_venv3_12) pi@raspberrypi:~/homeassistant_conf/lovelace/dashboard_elements $cat heat_b3_heat.yaml
type: thermostat
entity: climate.b3_heat
name: ""
show_current_as_primary: true
features:
  - type: "climate-hvac-modes"
    hvac_modes:
      - heat
      - 'off'
  - type: climate-preset-modes
    style: "icons"
    preset_modes:
      - home
      - sleep
card_mod:
  style: |
    ha-card .title {
      display: none;
    }
(ha_venv3_12) pi@raspberrypi:~/homeassistant_conf/lovelace/dashboard_elements $



### Javascript errors shown in your browser console/inspector

_No response_

### Additional information

Others have the same issue as reported in:
https://github.com/home-assistant/core/issues/110656
where I originally reported this, but it turned out that it's not the generic_thermostat.

home-assistant / frontend

Thermostat card: hvac_action does not update to idle on UI and Developer Tools->States #20017