Forecast / Tariff attribute Information - Confusion

[DriesA]

Hi,
I saw the latest release notes (2025.12.1), and now I am confused. :-)

I have a template sensor in Home Assistant to provide as input for the custom tariff source in EVCC. In generates an output like:

forecast: 
- start: '2025-12-09T23:00:00Z'
  end: '2025-12-10T00:00:00Z'
  value: 0.166863
- start: '2025-12-10T00:00:00Z'
  end: '2025-12-10T01:00:00Z'
  value: 0.158764

In EVCC.YAML I have defined this sensor as a source.

Do I read this breaking change correctly that I need to update my template to this new structure? Or is it related to something else?