Hello, like many others, I received the email regarding the enforcement of email verification for experience users who change their email address. Before this gets turned on in Summer '21, I've been testing in my dev site - the SF provided emails are working, but being sent twice. I also switched these out for custom email templates (also working), but still an getting duplicates. Both the previous and new email are being sent twice, with the exact same message and timestamp.

Anyone else getting two copies? Please let me know if you're aware of why two copies are being sent and how I might be able to solve this.