<?php

/**
 * Implements hook_preprocess_page().
 */
function alter_routing_preprocess_page(&$variables) {
    // Check if the current page is a node page.
    if (isset($page['#node']) && $page['#node'] instanceof \Drupal\node\NodeInterface) {
      // Load the front page content directly from its path.
      $front_page_path = \Drupal::config('system.site')->get('url');
      $front_page_node = \Drupal\node\Entity\Node::load(\Drupal::entityTypeManager()->getStorage('node')->getQuery()
        ->condition('type', 'page') // Change this to the content type if needed
        ->condition('status', 1)
        ->sort('created', 'DESC')
        ->execute()
      );
  
      // If front page content is found, replace node content with front page content.
      if ($front_page_node) {
        $view_builder = \Drupal::entityTypeManager()->getViewBuilder('node');
        $rendered_content = $view_builder->view($front_page_node, 'full');
        $page['content']['#markup'] = \Drupal::service('renderer')->render($rendered_content);
      }
    }
}
?>