no more info after home assistant update

[DJerike]

i am currently running Home assistant version 2023.4.6, and use the Faninfo information, so "low","auto" and "high" to make icons spin on state and change color on state.
If i update to Home assistant 2023.8.4 Faninfo only gives me "unknow" as state.
If i roll back to the previous version(2023.4.6) all works fine.
MQTT is working, i can controll the unit and all other sensor values are good and working.
If i look on MQTT info i see that de Faninfo message is correctly published but i get state "unknown" when i look it up in the entity page.
I think it is not an issue with the module, but home assistant changes something after the update.

this is where i use it:

type: custom:mushroom-template-card
entity: switch.ithofan_auto
icon: mdi:fan-auto
icon_color: |-
  {% if is_state('switch.ithofan_auto', 'on') %}
    green
  {% else %}
    red
  {% endif %}
badge_icon: mdi:fan
badge_color: teal
secondary: ''
card_mod:
  style: |
    {% if is_state('sensor.faninfo_sensor', 'low') %}
      mushroom-badge-icon {
        animation: rotation 1s linear infinite;
      }
      @keyframes rotation {
        100% {
        transform: rotate(360deg);
        }
      }
    {% endif %}

my configuration.yalm:

mqtt:
    sensor:
      - name: "ITHO CO2"
        state_topic: "itho/ithostatus"
        unit_of_measurement: "ppm"
        value_template: "{{ value_json['CO2level (ppm)'] }}"
      - name: "Fan speed"
        state_topic: "itho/ithostatus"
        unit_of_measurement: "rpm"
        value_template: "{{ value_json['Fan speed (rpm)'] }}"
      - name: "FanInfo sensor"
        state_topic: "itho/ithostatus"
        unit_of_measurement: ""
        value_template: "{{ value_json['FanInfo'] }}"
        unique_id: "fanInfo_sensor"

Device information

• Firmware version 2.5.4
• Hardware revision (?)
• Type/model number Itho (itho cve-s co2 optima inside)
• CC1101 RF module enabled [yes]
• In case of wifi issues, wifi access point (no issues)

Debug logging
Please provide debug logging from the debug page if possible:

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

[DJerike]

I got a tip from the home assistant community forum,

by removing

unit_of_measurement: ""

The problem was solved after this change.