Value change notification not working properly

I have created a notification for value change, i.e if a value in the field changes, the notification should be sent.
The way it works is:
When Status is changed to Shortlisted for 1st Round , the Interview Date and Time field will be displayed. And the value needs to be entered.

The interview reschedules email should be sent only if the value in Interview Date and Time changes. But the reschedule email is sent even when I am entering the value for the first time in Interview Date and Time and saving it.

Has anyone else experienced the same issue before?

I am facing this challenge as well, the notification is triggered on every Save event, instead of triggering only when the value of the Datetime has changed.

This issue was also mentioned in this thread