/**
* usage [thecontent 'id-1234]
* works fine in elementor
* but not gutenberg
**/

add_shortcode( 'thecontent', function ( $atts ) {
    $a = shortcode_atts(
        array(
		   'id' => '1',
	   ),
	   $atts );
     $post = get_post($a['id']);
     $content = apply_filters('the_content', $post->post_content);
     echo $content;
  } ) ;