Badge not generating when tests are run using rspec parallel gem

[AJ-Ayush]

I'm using the following rake task to merge results of different test runs, and generate HTML report of simplecov coverage -

namespace :coverage do
  desc "Collates all result sets generated by the different test runners"
  task :report do
    require 'simplecov'
    require 'simplecov_small_badge'

    # Collate coverage results using SimpleCov
    SimpleCov.collate Dir["test/simplecov-resultset-*/.resultset.json"], 'rails' do
      formatter SimpleCov::Formatter::MultiFormatter.new(
        [
          SimpleCov::Formatter::SimpleFormatter,
          SimpleCov::Formatter::HTMLFormatter,
          SimpleCovSmallBadge::Formatter,
        ]
      )
    end
  end
end

The combined coverage report is generated fine, but the badge is not being generated.