Discord integration generates errors in log

Configuration
1

I get below error when i call this service:

service: notify.discord
data:
  message: ''
  target:
    - 'channel_id'
  data:
    embed:
      title: You Got Mail
      description: '[{{now().strftime(''%d/%m/%Y %H:%M:%S'')}}]'
      url: ''
      color: 199363
      author:
        name: Home Assistant Dev
        url: ''
        icon_url: https://www.home-assistant.io/images/favicon-192x192-full.png
      thumbnail:
        url: >-
          https://icons.iconarchive.com/icons/graphicloads/100-flat/128/email-2-icon.png

output seem fine so am i formatting my code wrong or?

Discord_STdbmmbkUP

File "/usr/src/homeassistant/homeassistant/components/notify/legacy.py", line 229, in _async_notify_message_service
    await self.async_send_message(**kwargs)
  File "/usr/src/homeassistant/homeassistant/components/discord/notify.py", line 98, in async_send_message
    embed.set_footer(**embedding[ATTR_EMBED_FOOTER])
TypeError: set_footer() got an unexpected keyword argument 'thumbnail'