I have a form in which the username becomes pre-populated from the backend. When the page loads, the username is displayed in the username field. When lastpass boots, it changes username to the username, which is saved on the last pass. This is similar to the error that lastpass overwrites the username when it matters. Is there any way to prevent this?

In the above video, the predefined username is baz@qux.com . After lastpass is loaded, it will change to foo@bar.com .
PS. I am a developer. I am looking for a way to prevent this for my users.
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