The official web UI doesn’t let you enter more than 60 characters, but doesn’t indicate that at all. So you can keep typing past 60 characters but it won’t get added to the input field and you can’t really see that. If you paste a password into the field, it gets trimmed to 60 characters.
When creating a password, the server checks that it isn’t longer than 60 characters and returns an error if so. On login, however, it silently trims the password to 72 bytes, because that’s what the hashing algorithm they use supports.