This is not a bug, so it does not produce any kind of effect. However, the event subscriber 'PublicationDataSubscriber' is obsolete because it is based on an event that does not exist, namely 'onWorkbenchModerationStateTransition'..
The core module is named 'Content Moderation' and not 'Workbench Moderation', and there are no defined events in the new module. There is an issue in the core to implement this kind of event: https://www.drupal.org/project/drupal/issues/2873287 📌 Dispatch events for changing content moderation states Needs work
Remove the code related with this event subscriber.
Needs review
2.0
Code
The existing EventSubscriber provides integration for https://www.drupal.org/project/workbench_moderation/ →