cake3 validation rule not performed

Hi people, I have this validation rules in UsersTable.
The validator ignores the ->add(password, lenght) sentence.
The issue is when I try to create or update a record.

Best regards --cesar

public function validationDefault(Validator $validator) {
        return $validator
            ->validatePresence('username', 'create')
            ->notEmpty('username', __('This field is required.'))
            ->add('username', [
                'valid' => [
                    'rule' => 'email',
                    'message' => __('This field requires a valid email address.')
                ],
                'unique' => [
                    'rule' => 'validateUnique',
                    'provider' => 'table',
                    'message' => __('This field must be unique.')
                ]
            ])
            ->validatePresence('password', 'create')
            ->notEmpty('password', __('This field is required.'))
            ->add('password', [
                'length' => [
                    'rule' => ['minLength', 8],
                    'message' => __('Password must be at least {0} characters long.', 8),
                ]
            ])
        ;
    }

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