beforeSave vs beforeValidate

When I use this function as beforeValidate in users_controller it
works. When I change it to beforeSave (and remove the
parent::beforeValidate(); call) it returns to /users/edit (built via
scaffolding) with a flash "Please correct errors below." with no
errors identified in the form. Slug has no validation and state only
requires 2 case insensitive letters.

function beforeValidate() {
parent::beforeValidate(); // Just sanitizes input

// Automatically uppercase state string
if (!empty($this->data)) {
$this->data['User']['state'] = strtoupper($this->data
['User']['state']));
$this->data['User']['slug'] = Inflector::slug(strtolower
($this->data['User']['username']));
}
}

Since it works as beforeValidate I guess I have no need to modify it,
just curious why it doesn't work as beforeSave.

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