Extra data template not working for climate cards

[schmittx]

Documentation says that extra_data_template should work for climate cards, but it's not working for me. See configuration below and screenshots of result.

Checklist

• [x] I'm running the latest version of CustomUI (Update guide) or using a specific release that is not marked as "Broken".
• [x] I tried to force-refresh (Ctrl+Shift+R / Ctrl+F5) the browser
• [x] (Optional, but recommended) I'm using Chrome or tried to reproduce the feature on Chrome.

Browser + Version: Safari 11.1.1 and Chrome 67.0.3396.99

CustomUI version: 20180625

Home Assistant release (hass --version): 0.72.1

Problem-relevant configuration.yaml entries:

customizer:
  custom_ui: hosted
homeassistant:
  customize_glob:
    climate.*:
      custom_ui_state_card: state-card-custom-ui
      extra_data_template: >
        if (attributes.away_mode) return "Away Mode: " + attributes.away_mode; else return null;

Problem-relevant Home Assistant log entries: None

Any errors from browser Javascript console: None