Index.php

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<?php
namespace Magento\Cms\Controller\Adminhtml\Block;

use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;

class Index extends \Magento\Cms\Controller\Adminhtml\Block implements HttpGetActionInterface
{
    protected $resultPageFactory;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory
    ) {
        $this->resultPageFactory = $resultPageFactory;
        parent::__construct($context, $coreRegistry);
    }

    public function execute()
    {
        $resultPage = $this->resultPageFactory->create();
        $this->initPage($resultPage)->getConfig()->getTitle()->prepend(__('Blocks'));

        $dataPersistor = $this->_objectManager->get(\Magento\Framework\App\Request\DataPersistorInterface::class);
        $dataPersistor->clear('cms_block');

        return $resultPage;
    }
}