为什么required_if中没有显示验证消息？

Validator::extendImplicit('required_if_with_message', function ($attribute, $value, $parameters, $validator) {
    $data = $validator->getData();
    $otherField = $parameters[0];
    $otherValue = $parameters[1];

    if (isset($data[$otherField]) && $data[$otherField] == $otherValue) {
        return !empty($value);
    }

    return true;
});

'required_if_with_message' => 'The :attribute field is required when :other is :value.',

$rules = [
    'field1' => 'required_if_with_message:field2,value',
];

$messages = [
    'field1.required_if_with_message' => 'The Field 1 is required when Field 2 is value.',
];

$validator = Validator::make($data, $rules, $messages);