Error in Recurring Transactions processing sales Invoices in 1.5.7 and 1.5.8

[billott323]

WHen clicking on "process transactions" the first sales invoice to be processed, correctly posts and mails the invoice (only been checked with html), but then displays the updated invoice (showing its been mailed) for edit. Additionally, the date for the "next number" under Recurring Transactions is not updated, which meand running the recurring tranactions, again will recreate a new, but duplicate, invoice.

Posting Sales Invoice 911 ..... done
Sending Invoice 911
Action: reprint, ID: 1582
Edit Sales Invoice

The internal note on the invoice being displayed for edit shows

[email]
Date: Fri Jul 14 09:17:27 2017
To: billott323@gmail.com
Subject: Invoice 911

Message: sent

I have verified this on the same test DB for both 1.5.7 and 1.5.8