Set Component/Fix Version in post function does not set a component or version

public class SetComponentAndVersion implements FunctionProvider
{
    /**
     * Automatically assign subtasks the same component/version as parent task.
     */
    public void execute (Map transientVars, Map args, PropertySet ps)
        throws WorkflowException
    {
        MutableIssue task = (MutableIssue)transientVars.get("issue");
        
        if (task.isSubTask())
        {
            ComponentManager componentManager = ComponentManager.getInstance();
            IssueManager issueManager = componentManager.getIssueManager();
            MutableIssue parent = issueManager.getIssueObject(task.getParentId());
            
            task.setComponents(parent.getComponents());
            task.setFixVersions(parent.getFixVersions());
            task.store();
        }
    }
}