https://www.drupal.org/project/drupal/issues/3303557
Deprecate and remove the AJAX replace method [#3303557] | Drupal.org
Dec 20, 2024 - Problem/Motivation core/lib/Drupal/Core/Render/Element/RenderElement.php This looks like a Drupal 7 deprecation. // @todo Legacy support. Remove in Drupal 8....
deprecateremoveajaxreplacemethod