Why won't Safari v16 recognise 1Password extension?

I'm having no issues with it with Safari 16.0.

You may want to reinstall the extension of see the following 2 support articles: https://support.1password.com/update-1password-browser/

and

https://support.1password.com/missing-browser-button/

If that doesn't help, you may want to check the 1Password support forum: https://1password.community/

or contact 1 Password support: https://support.1password.com/contact/