Core Messages duplicated in Mercury Editor form

Problem/Motivation

I'm trying to send a status message using the core messenger service in Drupal 10. The message ends up being duplicated.

Its getting printed twice on the mercury editor page due to line 12 ({{ form['status_messages'] }}`) of mercury-editor-entity-form.html.twig.

Separate issue but related to the the same form (first time I have seen this) the following is printed out in the twig on development

<!-- INVALID FILE NAME SUGGESTIONS: See https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!theme.api.php/function/hook_theme_suggestions_alter
   mercury_editor_entity_form -->

Steps to reproduce

Don't judge as the following is just the start of my development for an assigned tasked and nowhere near complete.

I added the following to a hook_form_alter().

 $messenger = \Drupal::messenger();
      $state = $form["moderation_state"]['widget'][0]['state']['#default_value'];
      $messenger->addMessage(t('This content is currently @state.', ['@state' => $state]), MessengerInterface::TYPE_WARNING);

And the screenshot is what I see on my content node using Mercury Editor.

The top is the message printed from core and the bottom from mercury-editor-entity-form.html.twig.