I can't remember exact scenarios that triggered it, but I've seen situations where Chrome autofills data other than sign-in passwords as well (also ignoring autocomplete=off).

There was a form where administrator can change certain details of another user profile, and if e-mail (or name) field was empty on a profile, then chrome would autofill it with administrator's e-mail, which can result in unwanted / corrupted data.

Some replies in this thread suggest configuring chrome differently in organizations where this is important to avoid, but when you are SaaS vendor, your users will inevitably blame you for Chrome's behavior.