TYPO3 Core

file typo3/deprecated.php contains the following lines:

case 'alt_doc.php':
                GeneralUtility::deprecationLog(
                    'The entry point to FormEngine was moved to an own module. Please use BackendUtility::getModuleUrl(\'record_edit\') to link to alt_doc.php.'
                );
                \TYPO3\CMS\Backend\Utility\BackendUtility::lockRecords();
                /* @var $editDocumentController Controller\EditDocumentController */
                $editDocumentController = GeneralUtility::makeInstance(Controller\EditDocumentController::class);
                // Preprocessing, storing data if submitted to
                $editDocumentController->preInit();
                // Checks, if a save button has been clicked (or the doSave variable is sent)
                if ($editDocumentController->doProcessData()) {
                    $formProtection = \TYPO3\CMS\Core\FormProtection\FormProtectionFactory::get();
                    if ($formProtection->validateToken(GeneralUtility::_GP('formToken'), 'editRecord')) {
                        $editDocumentController->processData();
                    }
                }
                $editDocumentController->init();
                $editDocumentController->main();
                $editDocumentController->printContent();
            break;

but alt_doc.php is not there anymore and calling it result in blank page in backend