CLONE 2018R3 - TESTING - INF-10650- Past Occurrences - Edit Event Page - Clicking Back button displays Discard New Event message box after user saves updates

When user makes Edits to a Forecast Event and saves on Edit Events page:
1. The user is not taken back to the calendar
2. The Save toast confirmation is not displayed
when user clicks Back button the Discard New Event message box displays as if the user has not saved event updates

Reproduction Steps:
Navigate to Manage Events
On the calendar, select an Auto Event that is already scheduled
Click on the dot on the calendar to display the modal
Click on Edit
Add or delete a Past Occurrences
Click Save
*No successfully saved message indication
assuming it saved updates
Click Back button

Expected Results:
User is taken back to the calendar
Toast message is displayed 'Event updated saved successfully'.

Actual Results:
User stays on Edit Event page