People are reporting that mail bug correct? Why wouldn’t they fix it if it’s been happening for so long?
I did. I think they are getting very close to resolving it. In iOS 12, when you open the mail app, the new mail is already there with the badge showing the number of new/unread emails. In 13, the mail app takes a second to connect and download the new mail. Once it downloads, then you'll get the badge. Pesky background mail download bug I assume.
I actually didn’t experience it until beta 7. But it was pretty bad in 7. Beta 8 fixed it mostly, but still having some issues. Seems like a “push” issue.
I haven't noticed any mail issues on my 6s Plus.