After testing my D11 instance on PHP 8.4, I've come across a few issues:
Deprecated: Drupal\page_manager\Entity\PageVariantViewBuilder::resetCache(): Implicitly marking parameter $entities as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/html/modules/contrib/page_manager/src/Entity/PageVariantViewBuilder.php on line 46
Deprecated: Drupal\page_manager_ui\Form\VariantPluginAddBlockForm::buildForm(): Implicitly marking parameter $request as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/html/modules/contrib/page_manager/page_manager_ui/src/Form/VariantPluginAddBlockForm.php on line 65
Deprecated: Drupal\page_manager\Plugin\SectionStorage\PageManagerSectionStorage::access(): Implicitly marking parameter $account as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/html/modules/contrib/page_manager/src/Plugin/SectionStorage/PageManagerSectionStorage.php on line 206
PHP Deprecated: Drupal\entityqueue\Controller\EntityQueueUIController::subqueueListForEntity(): Implicitly marking parameter $entity as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/html/modules/contrib/entityqueue/src/Controller/EntityQueueUIController.php on line 76
If you have the module installed, by running drush you'll get the errors
Explicitelly declare the variable as nullable: https://php.watch/versions/8.4/implicitly-marking-parameter-type-nullabl...
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I've create a MR for it, kindly review.
For some reason the tests are failing, but I see that the other MRs are having the same problem so I guess that's fine for now.