Are blocks that are converted to patterns no longer filterable through the_content?

Turns out the answer to my question appears to be yes, patterns are no longer filterable through the_content. At least not directly in a way where you can filter them out of the content easily like you can a standard block.

For anyone looking, I wound up querying for the pattern directly then including in the partial I needed it in. Because I couldn’t filter it out of the content, this resulted in two instances of the block on the page. After trial and error, I wound up just hiding the fist (incorrectly placed) instance using a slightly involved sibling selector. All of this looked like this:

defining the function to query for the pattern by title:

// $block_title is the registered display title of the block
function elseloop_get_this_block($block_title="This Block") {
  // query for post_type 'wp_block'
  $query = new WP_Query(
    array(
        'post_type'              => 'wp_block',
        'title'                  => $block_title,
        'post_status'            => 'published',
        'posts_per_page'         => 1,
    )
  );

  // if there's content, run it through 'the_content' and return it
  if (!empty($query->post)) {
    $reusable_block = $query->post;
    $reusable_block_content = apply_filters('the_content', $reusable_block->post_content);
    return $reusable_block_content;
  } else {
    return '';
  }
}

using it in my template partial:

<div class="partial__this-block">
<?php elseloop_get_this_block('This Block'); ?>
</div>

and finally CSS to hide the first instance:

/* selects the first instance by ensuring it has a known sibling the second instance would never have */
.partial__this-block:has(~ .known-sibling) {
    display: none;
  }