After upgrading from CQ5.x to AEM6.2 or 6.3, all the scheduled activation and deactivation jobs don't get triggered ("Activate Later" feature). The workflows for those jobs never get triggered or completed.
Upgrade from CQ5.x to AEM 6.2 or 6.3
Known issue with Apache Sling.
In AEM6.4, a product level fix would be included. In older versions, follow the steps below:
If you performed an in-place upgrade, follow these additional steps: