[Concrete CMS] Unapprove page versions when a page is duplicated

app.php

<?php

if ($app->isInstalled()) {
    // Register Events
    /** @var \Symfony\Component\EventDispatcher\EventDispatcherInterface $eventDispatcher */
    $eventDispatcher = $app->make(\Symfony\Component\EventDispatcher\EventDispatcherInterface::class);

    // Unapprove page versions when a page is duplicated
    $eventDispatcher->addListener('on_page_duplicate', function ($event) {
        /** @var \Concrete\Core\Page\DuplicatePageEvent $event */
        $newPage = $event->getNewPageObject();
        $versionList = new \Concrete\Core\Page\Collection\Version\VersionList($newPage);
        $versionList->setItemsPerPage(-1);
        $versions = $versionList->getPage();
        /** @var \Concrete\Core\Page\Collection\Version\Version $version */
        foreach ($versions as $version) {
            if ($version->isApproved()) {
                $version->deny();
            }
        }
    });
}