Shrine 3 entity problem

_test.rb

require 'shrine'
require 'shrine/storage/file_system'
require 'image_processing/mini_magick'

Dir.mktmpdir do |tmp|
  Shrine.storages = {
    cache: Shrine::Storage::FileSystem.new(tmp),
    store: Shrine::Storage::FileSystem.new(tmp, prefix: 'uploads')
  }

  class Uploader < Shrine
    plugin :entity
    plugin :derivatives

    Attacher.derivatives_processor do |original|
      magick = ImageProcessing::MiniMagick.source(original)

      size_100 = magick.resize_to_limit!(100, 100)
      size_30 = magick.resize_to_limit!(30, 30)

      {original: original, small: size_100, tiny: size_30}
    end
  end

  class SomeEntity
    attr_accessor :image_data
    include Uploader::Attachment(:image)

    def initialize(image_data: nil)
      @image_data = image_data
    end
  end

  `curl https://cdn.pixabay.com/photo/2017/02/20/18/03/cat-2083492_960_720.jpg --output /#{tmp}/shrine.jpg`
  attacher = Uploader::Attacher.from_entity(SomeEntity.new, :image)
  attacher.attach(File.open("/#{tmp}/shrine.jpg"))
  p attacher.column_data
  ent = SomeEntity.new(image_data: attacher.column_data)
  ent.image_attacher.create_derivatives
end

output

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:-- 100  139k  100  139k    0     0   397k      0 --:--:-- --:--:-- --:--:--  397k
"{\"id\":\"a93a8da72458e1aaffbd4ba4f697d835.jpg\",\"storage\":\"store\",\"metadata\":{\"filename\":\"shrine.jpg\",\"size\":143288,\"mime_type\":null}}"
Traceback (most recent call last):
	16: from test_.rb:5:in `<main>'
	15: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/2.5.0/tmpdir.rb:93:in `mktmpdir'
	14: from test_.rb:39:in `block in <main>'
	13: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:184:in `create_derivatives'
	12: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:201:in `add_derivatives'
	11: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:228:in `upload_derivatives'
	10: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:466:in `map_derivative'
	 9: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:557:in `map_derivative'
	 8: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:557:in `inject'
	 7: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:557:in `each'
	 6: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:560:in `block in map_derivative'
	 5: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:575:in `map_derivative'
	 4: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:231:in `block in upload_derivatives'
	 3: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/gems/2.5.0/gems/shrine-3.0.1/lib/shrine/plugins/derivatives.rb:242:in `upload_derivative'
	 2: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/2.5.0/tempfile.rb:145:in `open'
	 1: from /home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/2.5.0/tempfile.rb:145:in `open'
/home/katafrakt/.rbenv/versions/2.5.6/lib/ruby/2.5.0/tempfile.rb:145:in `initialize': No such file or directory @ rb_sysopen - /tmp/shrine20191018-47070-1f2vf8c.jpg (Errno::ENOENT)