If a performance document review period ends and the document is not completed what is expected?

Summary:

Trying to test this scenario and I am struggling to see what is expected so wondered if any experience person can advise please.

Review period ends today and the manager has not yet evaluated and completed their employees performance document.

What are the expectations here? Should they see the doc and are they able to complete it? Only in my testing I am seeing the doc as the manager and I am able to still evaluate it when they shouldn't be able to..

Can anyone advise please? Thanks
Not sure if I need to wait until tomorrow to see whether the document is locked/visible etc.