Edit - controller.php

Edit: controller.php

<?php
namespace ElementorPro\Modules\Posts\Data;

use Elementor\Utils;
use ElementorPro\Data\Base\Controller as Controller_Base;
use ElementorPro\Plugin;

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

class Controller extends Controller_Base {

public function get_name() {
		return 'posts-widget';
	}

public function register_endpoints() {
		// There is only get items end point
	}

public function get_items( $request ) {
		$document = Plugin::elementor()->documents->get( $request->get_param( 'post_id' ) );

if ( ! $document ) {
			return new \WP_Error(
				'document_not_exist',
				__( 'Document doesn\'t exist', 'elementor-pro' ),
				[ 'status' => 404 ]
			);
		}

$element_data = $document->get_elements_data();
		$posts_widget = Utils::find_element_recursive( $element_data, $request->get_param( 'element_id' ) );

if ( empty( $posts_widget ) ) {
			return new \WP_Error(
				'Element_not_exist',
				__( 'Posts widget doesn\'t exist', 'elementor-pro' ),
				[ 'status' => 404 ]
			);
		}

set_query_var( 'paged', $request->get_param( 'page' ) );

/** @var \ElementorPro\Modules\Posts\Widgets\Posts $element_instance */
		$element_instance = Plugin::elementor()->elements_manager->create_element_instance( $posts_widget );

ob_start();
		$element_instance->render_content();
		$html = ob_get_clean();

return [
			'content' => $html,
		];
	}

public function get_permission_callback( $request ) {
		return true;
	}
}

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