Our login forms are on multiple pages and we can help autofill detect correct inputs with autocomplete="current-password" and autocomplete="username".

Explicitly defining an input element’s autocomplete value lets you support login workflows that couldn’t otherwise be detected by Password AutoFill’s heuristics. For example, the heuristics assume the user name and password inputs are on the same page. If you have a multipage login form, explicitly setting the username and current-password types lets the user tap and fill those inputs, even if they are on separate pages.

via https://developer.apple.com/documentation/security/password_autofill/enabling_password_autofill_on_an_html_input_element