If you're not using KeepassXC's browser plugin (or are using KeePassX, which -IIRC- never had a browser plugin), then its autotype feature will check the title of the window that has keyboard focus when deciding which entry to use. If one or more matches are found, it will [1] also ask you to confirm which entry you're about to have the software punch in. If no matches are found, it will alert you to that fact.

You might find the KeePassXC docs about the feature [0] to be informative.

If you're going to complain that all a phisher has to do to capture a password is create a website with the same title as the official one, then my reply would be something like "Duh. That's what the browser plugin is for.".

[0] <https://keepassxc.org/docs/KeePassXC_UserGuide#_auto_type>

[1] ...optionally, and on by default...

Not sure how you got the impression that I was unwilling to use a browser plugin.

I’m absolutely looking for a browser plugin. I would refuse to use an auto-type feature that only checks the window title instead of, as a browser plugin would do, the site’s domain.