Yes it goes away, but it's annoying as every time the phone is switched on, after 10 seconds or so the notification pops up and the phone vibrates which gets my attention as I don't know if it's an email/message or other notification. There doesn't appear to be a way to switch it off, as I can't find 'Messaging+' in any of the settings.
There is {49FE2D37-E6E7-427A-8552-35A874FE6FC8} in notifications and actions, which I think is messaging+ so might try turning banners off for that. Something's clearly broken though when it updated.