This was not a problem before 1Password X due to the new vs old nature of integration.
Simply put, I can't choose to save or update my password information until it is already too late.
I was on the Firefox open source team when they first introduced password saving, and it was a very deliberate decision that we made to allow actions on the password to happen AFTER the password is submitted.
Right now, for instance, I have passwords for sony rewards, sony credit cards, sony mmorpgs, sony playstation... etc, and when I scratch my head and pick one when Sony asks for my "sony account" credentials, I can't update or save whatever information is correct without digging into my vault to update things AFTER I've succeeded / failed. And if I do dig into my vault, I've already lost the exact internet address that asked for my login (many web pages will take you somewhere else to log you in).
At that point, I might as well run a password reset through the web site.
1Password Version: 7.3.712
Extension Version: 1.16.2
OS Version: Windows 10 64bit 1903 update
Sync Type: 1Password