Issue #3316336: Add support for Ckeditor 5

src/Plugin/Filter/EmbedBlockFilter.php

@@ -18,7 +18,7 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
  *   id = "embed_block",
  *   title = @Translation("Embed Block"),
  *   description = @Translation("Allows to place blocks into content."),
- *   type = Drupal\filter\Plugin\FilterInterface::TYPE_MARKUP_LANGUAGE,
+ *   type = Drupal\filter\Plugin\FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE,
  * )
  */
 class EmbedBlockFilter extends FilterBase implements ContainerFactoryPluginInterface {