TYPO3 Core

When a page has USER_INT or COA_INT objects and is delivered from cache, the page title is overwritten with standard PageTitleProviders.

1. Insert plugin with cacheable action which has own PageTitleProvider. This PageTitleProvider has setter which is called from this cacheable action - e.g. $pageTitleProvider->setTitle($detailObject->getTitle().
2. Insert some none-cacheable content.
3. When the page is cached, the page title from plugin's PageTitleProvider is never displayed.

• If the page has some none-cacheable content, then $controller->INTincScript() is called in TYPO3\CMS\Frontend\Http\RequestHandler->handle().
• In TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController is then called the generatePageTitle() method.
• All pageTitleProviders are loaded in TYPO3\CMS\Core\PageTitle\PageTitleProviderManager.
• Since the custom pageTitleProvider's setter is never called (because action is cached), the getTitle() result is empty.
• If the none-cacheable content doesn't set the page title, then name of the page is taken as page title.

Possible solution:
TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController->generatePageTitle() and TYPO3\CMS\Core\PageTitle\PageTitleProviderManager->getTitle() should have some boolean argument to know when this is called. When called from TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController->INTincScript(), standard pageTitleProviders (altPageTitle, seo, record) should not be loaded again, because that result was already cached.

Related to:
https://forge.typo3.org/issues/86234
https://forge.typo3.org/issues/87683