Currently running 1Password 7.7 Beta-2 in Safari, which now has the 1PasswordX-like auto-fill feature of certain fields. Right now it’s treating any field that might contain usernames as an autocomplete field for 1Password to fill. That in turns is overriding the Discourse options, rendering type-and-search useless. See image:
I did some digging on 1Password’s website to see how to potentially disable this in the HTML and found this:
https://support.1password.com/compatible-website-design/