Expense Reports - first use of Per Diem and Location Change by an approver

I have bumped into an interesting issue and am curious if others have seen it.

I have made some attempts to replicate in demo but Per Diem in demo is...is....perplexing to me

The scenario:

1) Traveler creates and submits an expense report (any number of transactions, any number of per diem transactions...can be seen with a one line expense report)

2) The approver changes the location on the first Per Diem line (Meals being most commonly the first per diem for us...does not have to be the first line in the report just the first occurrence of a per diem expense)