I changed my email for the 1Password account using its web interface at https://my.1password.com/profile . Now the new email is shown as my email, so it seems I could have successfully changed my email.
However, I found I can still log in using my old email (of course with the valid secret key and master password). I logged out, and then tried logging in with the old email. I used Safari's private window to make sure any information is not stored in the browser. And I could successfully log in with the old email, and after the log-in, the browser shows the new email. I tested the same using totally irrelevant email as well, and in that case login rejected, which indicates my old email is still stored with my account.
Is this an expected behavior? How can I remove the old email from the account information?
1Password Version: 7.5
Extension Version: Not Provided
OS Version: macOS 10.15.5
Sync Type: Not Provided