Can't get card-templater working

Hello,
I’ve been trying to get this code working without success so far

type: 'custom:card-templater'
card:
  type: entities
  show_header_toggle: false
  title: Prévisions
  entities:
    - entity: sensor.722
      name_template: >
        {{state_attr("sensor.722","description")}}

It displays a simple dash sign whereas the name_template value does return a string (checked in developer/templates) which is in this case: “Aujourd’hui”
I’m running HAOS 2023.3.0. Is this custom card supposed to be still working? Am I doing something wrong?
Thank you