Approver Receives Duplicate Emails after Adding Expense Lines and Saving Changes

I am experiencing an issue in our test environment on 9.2 with travel on Image 20, PeopleTools 8.55. When an approver modifies an expense report by adding more than one new line to the report, and then clicking Save Changes button - the report leaves the worklist and returns, and at this time the approver receives duplicate email notifications (one for each new line added letting them know the report is now on their worklist awaiting approval).

Should the approver receive an email notification when using the Save Changes button?

They do not receive a duplicate email for each line when the report is originally submitted and it enters their worklist.