File size for nullable field

[alaksandarjesus]

I am collecting an array of images from multipart/form-data

    <table class="table table-bordered">
                    <tbody>
                        <tr>
                            <th>Primary Image</th>
                            <td>
                                <input type="file" name="primary" class="primary" accept="image/*">
                            </td>
                        </tr>
                        <tr>
                            <th>Image - 1</th>
                            <td>
                                <input type="file" name="images[]" class="images">
                            </td>
                        </tr>
                        <tr>
                            <th>Image - 2</th>
                            <td>
                                <input type="file" name="images[]" class="images">
                            </td>
                        </tr>
                        <tr>
                            <th>Image - 3</th>
                            <td>
                                <input type="file" name="images[]" class="images">
                            </td>
                        </tr>
                        <tr>
                            <th>Image - 4</th>
                            <td>
                                <input type="file" name="images[]" class="images">
                            </td>
                        </tr>
                    </tbody>
                </table>

and my validator is

    $rules = [
        'nonce' => 'required|nonce',
        'uuid' => 'required',
        'primary' => 'required|min:1000000|max:5000000|mimes:jpg,jpeg,png,webp',
        'images.*' => 'nullable|min:1000000|max:5000000|mimes:jpg,jpeg,png,webp',

    ];
    
    $errors = $validator->validate($_GET + $_POST + $_FILES, $rules);

    if (!empty($errors)) {

        wp_send_json_error(['message' => $errors]);
    }

The rule is primary image is required and rest of the images are optional. So I have mentioned them as nullable.

The issue is at images.* when I do not select any images, they are not passing, as the minimum requirement is 1MB. But my post call is having the empty file selector reference.