Everyone else has figured this problem out, it's your turn now. "Every website uses different formats" is NOT an excuse for how absolutely horrible the autofill experience is on Proton.

The autofill features are very much not refined. I've had much better experiences with browser's autofill. Something that really infuriates me is when I already have an email alias for a website, and just because it isn't a log-in it offers to create new aliases or use my main email. That is NOT what I want, I want it to use the already pre-established email aliases I'm already using for this website, it should offer those first, then if I want to create a new alias for the same site I'm already using one for, then you can offer that option at the bottom. It makes it extremely difficult to use most sites because there's a lot of times where I'm not logging in but I need to enter my email for that site (and because it's an alias I have to actually search and copy it), in addition this feature would also improve the autofill not detecting login screens, as it's now searching for more than just login screens. Sometimes I have to autofill through just the password section, then it works it's way up and autofills the username/email section, when attempting to fill the email/username first in certain websites (which is how it's supposed to work) the autofill suggests my primary email address and then a newly created alias underneath that instead of the saved login information for that website. And sometimes autofill on specific websites just doesn't work at all.

In addition to the login autofill being very bad, the personal information autofill is EVEN WORSE. It can't select options from a dropdown menu when every web browser I've used absolutely can, it also for me personally NEVER FILLED the second address line, even though I did put the 2nd address line in under the "Floor, apartment, building" section. Also for country, you need to make a clear decisive selection that will compensate for dropdown menus as well. Currently I don't know if it wants me to put US, USA, or United States of America, as I have no idea which will let it work properly because many different websites require many different formats.

Autofill NEEDS to be fixed, it makes Proton especially hard to recommend to other people because how am I supposed to recommend a product to other people when it doesn't work as well and is more difficult than the free options included in web browsers already? The only reason why I continue to use Proton pass for the time being is because I spent so much effort setting it up how I wanted, if I don't start experiencing improvements I will start considering alternatives, I'm hoping it doesn't come to that. If you're uncertain about making reworks or adding such improved features, just make them optional in proton-pass settings. Regardless the state of autofill is really inexcusable at this point.
Details: Linux MintOS & CachyOS, Brave Web Browser, Proton-pass Chromium Extension