Error in composer when trying to override view for image block

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I'd like images on my site wrapped in a <figure> tag, so I tried to override the default image block view as below by creating blocks/image/view.php with the content below:

<?php 
   defined('C5_EXECUTE') or die("Access Denied.");
   echo "<figure>";
   $this->inc('../../concrete/blocks/image/view.php');
   echo "</figure>";
?>


This seems to work, except that when I go to the compose view (to, for example, write a blog post), I get two big errors where the image attachment fields should be that say it can't find "blocks/image/composer/header.php" or "blocks/image/composer/thumbnail.php". I was trying to debug this and found that even if I just create an empty "blocks/image" folder I start getting these error. Maybe I am misunderstanding the documentation, but it seems like if it can't find the files in "blocks/image/" it should look in "concrete/blocks/image/" (where the files actually exist).

Any suggestions for how to fix this?

- Adam