Again struggle with templates

@hajo62 wrote:

I have two sensors:

The first results in:
{ "timestamp": "2020-03-24T17:00:00+01:00", "value": 369.0, "trend": -1, "stateMnwMhw": "normal", "stateNswHsw": "normal" }
and to extract the value, I use this template sensor:

  - platform: template
    sensors:
      rheinpegel:
        value_template: >
          {% set state = states('sensor.rheinpegel_object') | from_json %}
          {{ state.get('value', 'unknown') | multiply(0.01) }}

The second one results in:
{‘cases’: 32879, ‘deaths’: 140, ‘recovered’: 830, ‘tested’: ‘unknown’}

But with template below that does not work and throws:
Error rendering template: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)

What’s different?

  - platform: template
    sensors:
      cases:
        value_template: >
          {% set state = states("sensor.berliner_morgenpost") | from_json %}
          {{ state.get("cases", "nix")  }}

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