Pop-up with only identities

Sometimes when I get to the authorization fields on a web site, the 1Password pop-up menu only shows me some of the contact information I have set up in Identities, it doesn't show any Logins I have even though they match the URL

For example, in GMail you can set it up to send email from another email account. This pops up a new window which asks for the SMTP server to use, then the credentials for that server. I use GMail's smtp server and then I have saved the login info for my GMail account with a special "app password" that it can use for this. However, when I get to the username field, the pop-up menu only shows me usernames and emails from some of my "Identities", but not from the login whose website URL matches that popup window.

I have seen this occasionally in other cases but I can't remember them right now, this one is current.

I have a fully updated 1Password and extension, running in updated Firefox and Chrome with the same result.