There isn’t a way to track progress since it is an internal ticket. I reviewed the details of the ticket, and it appears that this defect is only present when redirecting emails to a test address. If you disable the test address option in the email config, then the original recipient should show up properly.
There are a couple of proposed solutions. One is omit the “Original recipient” text from subject if it’s being redirected to a test address. The other option is to have an email show up in place of null. If there is a solution you prefer, I can forward your choice to the engineering team.