<% if image_block.file && image_block.file[:url] -%>
  <figure class="item__content-block item__content-block--image">
    <%= image_tag image_block.file[:url] %>
  </figure>
<% end -%>

<% if image_block.file && image_block.file[:url] -%>
  <figure class="st__content-block st__content-block--image">
    <%= image_tag image_block.file[:url] %>
  </figure>
<% end -%>

Fix class names for image block
Fix class names for image block