Round(2) doesn't work anymore?

Hi
I’ve created a few sensor_templates - but noticed, that the function round() doesn’t work anymore… ?!

# Calculation of Total Savings in €
    solaredge_total_savings:
      friendly_name: 'Total Savings €'
      unit_of_measurement: '€'
      value_template: >-
        {{ states('sensor.solaredge_total_selfconsumption_kwh') * 28.20 / 100 | round(2) }}

can anyone give me an advice, what’s wrong here?
Thanks

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