When resending invoices they are sent to original email address, even if it's been deleted in the QBO system

When doing collections, I often find that an email address we had for a customer is no longer a valid one and need to change it.  I do so in the customer profile without any issues.  However, when I go to resend the invoice(s) (which almost ALWAYS needs to happen) the default email that continues to show up in the "to" email address field in QBO is the OLD address which was deleted from the customer profile.  So, I have to remember to manually go in and type in the correct email address(es) before sending and there is no way to send a batch of invoices as they will all go to the old non-existent email address.  This is quite problematic and I don't understand why any open invoices in the system automatically default to the email address where the invoice was originally sent when we re-send them after changing the email address in the customer profile.  Anybody?