Issue #3121431 by Neslee Canil Pinto: Add core_version_requirement for Drupal 9

templates/misc/status-messages--alerts.html.twig

@@ -25,7 +25,7 @@
  * @ingroup themeable
  */
 #}
-<div class="alert-wrapper">
+<div class="alert-wrapper" data-drupal-messages>
 {% for type, messages in message_list %}
   {%
     set classes = [

templates/misc/status-messages--toasts.html.twig

@@ -27,7 +27,7 @@
 #}
 {{ attach_library('bootstrap_barrio/toast') }}
 
-<div class="toast-wrapper" aria-live="polite" aria-atomic="true">
+<div class="toast-wrapper" aria-live="polite" aria-atomic="true" data-drupal-messages>
 
   {% for type, messages in message_list %}
     {%

templates/misc/status-messages.html.twig

@@ -25,6 +25,7 @@
  * @ingroup themeable
  */
 #}
+<div data-drupal-messages>
 {% for type, messages in message_list %}
   {%
     set classes = [
@@ -68,4 +69,4 @@
     {% endfor %}
   </div>
 {% endfor %}
-
+</div>