No, you’re not. Actually, I think that, too. That’s why I suggested, that maybe the best compromise to make the auto-fill button larger without taking space away from being able to read the item title and username, would be to make the item the button, so to speak, like you can see here:
(only an amateurish draft - and details could be different in the end… - but just as a general idea of how it could be; BTW I didn’t want to make the effect larger, it’s just that I like the extra wide setting for now and didn’t think of it while making the screenshots 
)
I think when it becomes the button, the inconsistency of the old UI may be reduced as well (as they at least wouldn’t look the same (normal vault items and “auto-fill-items”) - the one would be an item and the other one would essentially “be” a button → in the previous UI, they both basically looked the same).
And at the same time, you don’t have the button text and vault item title and username competing about the space. And no shift of the attention (reading the item title and username first → then aiming at the smaller, and from the item text separated, auto-fill button) which make it slower in the current design, I think.
So in my view, it makes sense to integrate the button and the vault item text and username into “one”. (BTW, I didn’t include the clickable buttons on the right into my “auto-fill-button”, because I thought it would get confusing what a click in that areas to the right would result in - auto-fill-button-action or the other button-click-actions… but that may have the designers to solve, how it would actually be done best)
My idea may be not ideal. It may not be It is not 100% like it was. But it may be the best compromise between everything.
(though I also like to mention again, for everyone who is frustrated right now with the “small auto-fill” button that there are several other methods of auto-filling)
PS: In case someone wonders…: I created the dummy favourites, so that they are there as a design comparison to my button-item and at the same time don’t reveal any personal data.