attachment_properties thumb url does not work anymore

[Santhosh-Umapathi-Beautyze]

thumb_url does not work anymore, does not display the image.

eg: JSON

attachment_properties: {
        thumb_url: 'https://i.imgur.com/jpC7MzJ.png',
        fields: [{
          title: "Release",
          value: SLACK_VERSION,
          short: true
        },
        {
          title: "Release Notes",
          value: SLACK_RELEASE_NOTES,
          short: false
        },
        {
          title: "Store",
          value: "Apple ",
          short: false
        }]
      }

Results: