Is Object Workflows Execution Schedule working?

Content (please ensure you mask any confidential information):

I set up Email Notification on Update for Activity in Object Workflows. When a record is updated, it is triggered by the condition "DueDate != null" and an email is sent.
In this case, the Execution Schedule is set to "3 Days Before DueDate."
However, once you save the activity, an immediate email will be sent regardless of the deadline you set.

How should I configure it so that it works as expected?

Please see the attached file for details.

Version (include the version you are using, if applicable):

24B (11.13.24.04.0)