This is the main dealbreaker for me at the moment.
I was able to log in to 1Password, and it shows the login email when clicked on the email field of a website. But clicking it doesn't get filled. And then by clicking the 1P icon on the toolbar, the Autofill button doesn't work. Even the copy button doesn't work. So I have to use system 1P every time I need to log in.
On a similar note, Grammarly is also not working properly here. Shows logged out even when you're logged in.
+1 to not showing these on popular extensions until they start working.