'#type' => 'webform_html_editor' element with '#required' => TRUE does not display a 'field is required' message on save

Problem/Motivation

When implementing a required field of type webform_html_editor, the required field is not validated it contains data.

Current behavior:

A required webform_html_editor field can be saved without input.

Expected behavior:

A required webform_html_editor field produces an error message on webform save "The field Administrative description is required."

Steps to reproduce

Introduce a '#type' => 'webform_html_editor' where '#required' = TRUE:

$form['general_settings']['description'] = [
      '#type' => 'webform_html_editor',
      '#title' => $this->t('Administrative description'),
      '#default_value' => $webform->get('description'),
      '#required' => TRUE,
    ];

Save the webform:

Proposed resolution

It seems the magic in Drupal\webform\Element\WebformHtmlEditor::validateWebformHtmlEditor() doesn't get executed when there are other errors in the settings form. This causes an array to be set for $element['#value']['value'] in preRenderWebformHtmlEditor().

Adding the code below to preRenderWebformHtmlEditor seems to help, feels kind of wrong though. Don't know enough about the history of the webform_html_editor form field type to provide an alternative? Any suggestions would be welcome.

if(is_array($element['#value']['value'])){
  $element['#value']=$element['#value']['value'];
  $element['#format']=$element['#value']['format'];
}

Remaining tasks

User interface changes

API changes

Data model changes