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  • I found another post with the solution.

    
    add_action( 'save_post', 'set_featured_image_from_gallery' );
    
    function set_featured_image_from_gallery() {
      $has_thumbnail = get_the_post_thumbnail($post->ID);
    
      if ( !$has_thumbnail ) {
    
        $images = get_field('car_gallery', false, false);
        $image_id = $images[0];
    
        if ( $image_id ) {
          set_post_thumbnail( $post->ID, $image_id );
        }
      }
    }