Why doesn't CarrierWave 1.1.0 load images (works on 0.11.2)?

Question

Ruby on Rails

Hello!
Updated CarrierWave to version 1.1.0 and it stopped downloading files.
Example uploader:

class SmallImageUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick

  storage :file

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{model.id}/#{mounted_as}"
  end

  version :thumb do
    process :resize_to_fill => [30, 30]
  end

  def filename
    if original_filename
      @name ||= Digest::MD5.hexdigest(File.dirname(current_path))
      "#{@name}.#{file.extension}"
    end
  end
end

In the model:

class Page < ApplicationRecord
  mount_uploader :small_image, SmallImageUploader
end

In the logs, you can see that the picture comes in the parameters, and the record in the database is being updated:

Started PATCH "/admin/pages/3" for 127.0.0.1 at 2017-07-01 20:33:58 +0300
Processing by Admin::PagesController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"pX1q4bYOc53S3wB1DHIMOQ2cakqNs9yZOlVeoMnfXjY/HdeTw2gm6TxdF5VYduDOwG6ZRHTdo9xhWk8Jd8zVbw==", "page"=>{"parent_id"=>"1", "template_id"=>"3", "is_published"=>"1", "sitemap_included"=>"1", "current_page_id"=>"3", "current_page_parent_id"=>"1", "short_slug"=>"test", "title"=>"тест", "meta_title"=>"тайтл", "meta_description"=>"", "h1"=>"h1 заголовок", "description"=>"", "content"=>"", "small_image"=>#<ActionDispatch::Http::UploadedFile:0x007fd922fe3578 @tempfile=#<Tempfile:/var/folders/fc/brjvffk935ldlwt9k6h7r9y80000gn/T/RackMultipart20170701-3007-irj5st.png>, @original_filename="artSoft.png", @content_type="image/png", @headers="Content-Disposition: form-data; name=\"page[small_image]\"; filename=\"artSoft.png\"\r\nContent-Type: image/png\r\n">}, "id"=>"3"}

SQL (0.6ms)  UPDATE "pages" SET "small_image" = $1, "updated_at" = $2 WHERE "pages"."id" = $3  

But the file itself does not appear in the uploads folder. Everything works correctly in CarrierWave 0.11.2. What could be the problem?
Rails version 5.1.2
Tested on my MacOS 10.12 machine and Ubuntu 16.04 server