Thanks for the report. Previously AuthenticationForm's username field had "max_length" always set to 254, currently it should use "max_length" from the model's username field (see https://code.djangoproject.com/ticket/27515 and https://github.com/django/django/commit/5ceaf14686ce626404afb6a5fbd3d8286410bf13). However HTML "maxlength" attribute is not set anymore so it's a regression I created a new ticket https://code.djangoproject.com/ticket/30776.
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