Earlier quoted context omitted.
I once had to open up my developer console and manually set the field with JavaScript because they didn't want me pasting into the password field. Although the site was also all kinds of broken so it might have actually been an accident that pasting into the field didn't work.
I do this on quite a few sites. Most of the easy ones have an easy to find onpaste event wired in the DOM and it's a simple delete. I feel like there are so few legitimate uses of onpaste and the browser should have an easy override that if I ctrl+v three times in quick succession or something like that it ignores or disables onpaste events. Alternatively, my password manager does have a decent "autotype" tool when a…
$0.value = "asd";
instead of finding the onpaste event.