PRT emailed invoice to the wrong contact after the contract was updated

Background: A user created a draft invoice, realized the contact information was incorrect, amended the contract to update the contact, approved the contract amendment, then submitted the invoice. The PRT job sent the email to the old contact instead the updated one even though the amendment was approved before the invoice was submitted.

Question: When is the contact information referenced? (e.g., upon draft invoice creation, invoice submission, PRT job running, etc.)

Steps:

1. User created draft invoice
2. User identified incorrect contact was referenced
3. User amended contract > Bill Plan > Contact to update the contract
4. User approved contract and submitted draft invoice