<layout-section> element renamed to <drupal-layout>

The custom elements used for a layout's sections (used by Layout Builder), have been renamed from <layout-section> to <drupal-layout>.

Front end code should be updated accordingly, while updating to version 3 of the module.

Alternatively, reverting to the old values can be done with an alter hook:

function MYMODULE_custom_element_entity_alter(CustomElement $custom_element, ContentEntityInterface $entity, string $viewMode) {
  // Revert tag names of layout builder sections to version 2.
  $slots = $custom_element->getSlots();
  if (isset($slots['sections'])) {
    // Only change if all "sections" slots contain a nested element with tag "drupal-layout".
    $unexpected_value = FALSE;
    foreach ($slots['sections'] as $slot) {
      if (!isset($slot['content']) || !$slot['content'] instanceof CustomElement
          || $slot['content']->getTag() !== 'drupal-layout') {
        $unexpected_value = TRUE;
        break;
      }
    }
    if (!$unexpected_value) {
      foreach ($slots['sections'] as $slot) {
        $slot['content']->setTag('layout-section');
      }
    }
  }
}