Assignee can see the deferred task for a Probation Journey with property set to 'Hide'

Summary:

Assignee can see the deferred task for a Probation Journey with property set to 'Hide'

Content (please ensure you mask any confidential information):

We have created a Probation Journey where a Line Manager completes review tasks and then confirms the Probation has been successful using a questionnaire. The Employee then receives a successful letter in a separate task. However, we are observing that the Employee (Assignee) can see the successful letter task (greyed out) before the probation outcome has been concluded. How can I make sure this is not in view of the Employee before the outcome has been reached. The checklist property for deferred task is set to 'hide' for assignee and there is a delay set on