I ran into this yesterday but I cannot easily reproduce it: my server is located in Europe (GMT+1), but I’m currently in California (PST). When I got the ‘your beta invite is ready’ email, it was evening of Nov 4 in California, early morning Nov 5 in Europe. So I configured my server and then tried the new certificates. Since they were issued on Nov 5 Europe time, my clients in California wouldn’t accept them as it was still Nov 4 PST. I understand this is only a temporary issue that resolves after 1 day max, but with the mandatory renewal every 90 days it still happens too often for my liking - especially with the automated renewal process in effect.
Are you aware of this? Can you predate the certificate?