HTML tags showing in Caption

I got this working by creating a custom Twig filter for html_entity_decode and then adding it to a filter-caption.html.twig template override. Bit clunky though. Looks like Drupal Media can handle HTML in captions just fine.

I had the same problem after moving from Drupal 9.5 to 10.2.

I can't figure out why this abruptly changed the way it rendered (some Twig 3 change?) but it's happening because the value is passed through escapeValue.

You could always remove the validate from the element, but of course... that's probably a bad idea.

function my_module_form_entity_embed_dialog_alter(&$form, FormStateInterface $form_state, $form_id) {
  $storage = $form_state->getStorage();
  // On step three of the modal form remove validation from the caption field.
  if (isset($storage['step']) && $storage['step'] === 'embed') {
    if (isset($storage['entity_element']['data-caption'])) {
      unset($form['attributes']['data-caption']['#element_validate']);
    }
  }
}