solar-entity shows no state after an mistake by myself

[jove01]

Describe the bug
I had defined a template sensor and put it in solar-entity. There I saw, that I have done a mistake. So I deleted the sensor an defined a new one with the same name.

Than I deleted the old entry in solar-entity and saw there is no state. After that I saw the old and the new sensor in statistics. There I deleted als the old one and restarted HA.

But after that in solar-entity is no value. In all other cards after that created for testing with this sensor I see a value.

So I think somewhere ist the old UUID (o.ä) intern saved.

The errors occurs in different browsers an the android-version.

All Updates are the newest.

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Expected behavior
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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]

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[jove01]

Maybe I found the reason:
It is not possible to use 2 solar-entity. So I defined 1 and added my to solar-entities

`    - name: "Daily PV-Ertrag"
      unique_id: daily_pv_ertrag
      device_class: energy
      state_class: measurement
      unit_of_measurement: kWh
      state: >-
        {% if states('sensor.daily_pv_generation') == 'unavailable' or
          states('sensor.tp_stecker_pv_heutiger_verbrauch') == 'unavailable'
          %}
          {{ states('sensor.daily_pv_ertrag') }}
        {% else %}
        {{ 
        states('sensor.daily_pv_generation')| float(0) + 
        states('sensor.tp_stecker_pv_heutiger_verbrauch')| float(0)
        }}
        {% endif %}`

I think the state_class "measurement" is not allowed!

But what is the way to define 1 solar-sensor as "sum" of 2?