Wrapping ActiveRecord test causes it to fail (no records found) about database_cleaner-active_record HOT 3 OPEN

Fetching gem metadata from https://rubygems.org/..........
Fetching version metadata from https://rubygems.org/.
Resolving dependencies...
Using i18n 0.7.0
Using json 1.8.3
Using minitest 5.10.1
Using thread_safe 0.3.5
Using builder 3.2.2
Using arel 6.0.4
Using database_cleaner 1.5.3
Using diff-lcs 1.2.5
Using mysql2 0.4.5
Using rspec-support 3.5.0
Using bundler 1.13.7
Using tzinfo 1.2.2
Using rspec-core 3.5.4
Using rspec-expectations 3.5.0
Using rspec-mocks 3.5.0
Using activesupport 4.2.7.1
Using rspec 3.5.0
Using activemodel 4.2.7.1
Using activerecord 4.2.7.1
-- create_table(:widgets, {:force=>true})
   -> 0.0701s
-- add_index("widgets", ["description"], {:name=>"widgets_description_fts", :type=>:fulltext})
   -> 0.4454s

Randomized with seed 46507

Widget
  .text_search
    succeeds with manual cleaning (fails at random, unless it is first or the only test run)
    fails when cleaning with start/clean (FAILED - 1)
    fails when cleaning with block (FAILED - 2)
  .like_search
    succeeds when cleaning with block
    succeeds when cleaning with start/clean
    succeeds with manual cleaning

Failures:

  1) Widget.text_search fails when cleaning with start/clean
     Failure/Error: expect(Widget.text_search("fox")).to contain_exactly match
     
       expected collection contained:  [#<Widget id: 5, description: "The quick brown fox jumps over the lazy dog">]
       actual collection contained:    []
       the missing elements were:      [#<Widget id: 5, description: "The quick brown fox jumps over the lazy dog">]
     # ./mysql2_full_text_issue.rb:122:in `text_search_test'
     # ./mysql2_full_text_issue.rb:66:in `block (3 levels) in <main>'

  2) Widget.text_search fails when cleaning with block
     Failure/Error: expect(Widget.text_search("fox")).to contain_exactly match
     
       expected collection contained:  [#<Widget id: 8, description: "The quick brown fox jumps over the lazy dog">]
       actual collection contained:    []
       the missing elements were:      [#<Widget id: 8, description: "The quick brown fox jumps over the lazy dog">]
     # ./mysql2_full_text_issue.rb:122:in `text_search_test'
     # ./mysql2_full_text_issue.rb:73:in `block (4 levels) in <main>'
     # ./mysql2_full_text_issue.rb:72:in `block (3 levels) in <main>'

Finished in 0.68526 seconds (files took 1.07 seconds to load)
6 examples, 2 failures

Failed examples:

rspec ./mysql2_full_text_issue.rb:63 # Widget.text_search fails when cleaning with start/clean
rspec ./mysql2_full_text_issue.rb:71 # Widget.text_search fails when cleaning with block

Randomized with seed 46507

#  spec/support/database_cleaner.rb
RSpec.configure do |config|
  # ...
  config.before(:each) do
    DatabaseCleaner.start unless manually_cleaned?
  end

  config.append_after(:each) do
    DatabaseCleaner.clean unless manually_cleaned?
  end

  def manually_cleaned?
    self.class.metadata[:manually_cleaned]
  end
end

RSpec.describe Widget, manually_cleaned: true do
  # ...
end