Library / style drowl_paragraphs/admin missing on "Choose a component" form / modal

Looks like we need to replace

/**
 * Implements hook_form_layout_paragraphs_component_form_alter().
 */
function drowl_paragraphs_form_layout_paragraphs_component_form_alter(array &$form, FormStateInterface &$form_state){
  // Add backend library form to layout_paragraphs form:
    $form['#attached']['library'][] = 'drowl_paragraphs/admin';
}

to catch this case.

Let's try to use the more general

/**
 * Implements hook_preprocess_layout_paragraphs_builder().
 */
function drowl_paragraphs_preprocess_layout_paragraphs_builder(array &$variables) {
  // Add backend library form to layout_paragraphs builder form.
  $variables['#attached']['library'][] = 'drowl_paragraphs/admin';
}

instead. Hope it's the right one...

Tested and works. I'll track #3350177: Missing hook to alter ChooseComponentController::list or ::componentMenu for possible updates / maintainer feedback from layout_paragraphs.

I'll tag a new release.

Doesn't work or doesn't work anymore, really strange.

Here's the regression issue:
#3350177: Missing hook to alter ChooseComponentController::list or ::componentMenu