Change fee selection for text price field on backoffice Event registration Not Creating Correct Financial Items

1. Create pending pay later event registration with text field price option say qty 1 x $10
2. Pending pay later contribution no showing any financial transactions as expected
3. Edit selections on event registration by changing qty to 2 (i.e. $20)
4. Pending pay later contribution STILL no showing any financial transactions as expected.

Bug : There is only 1 financial item record that refers to previous line-item of $10 amount. However, finacial trxn correctly records the surplus $10.

Expected: There should be 2 financial items refers to old line-item and updated line-item surplus amount and also should be linked with corresponding financial trxns.