Consumer#cancel doesn't work inside subscribe block

rpc.rb

require 'bunny'
require 'json'

puts Bunny::VERSION # => 1.2.1

bunny_config = {
  log_level: :debug
}

connection = Bunny.new bunny_config
connection.start

request_id = rand(36**32).to_s(36)

request = {
  id: request_id,
  data: {
    words: ['goat', 'hoax', 'jelly', 'kitty', 'post'],
    pair: ['jelly', 'kitty']
  }
}

routing_key = 'pair_it'
exchane_name = 'gothic.exchanges.direct.ci'


result_channel = connection.create_channel
request_channel = connection.create_channel

result_exchange = result_channel.direct(exchane_name)

request_exchange = request_channel.direct(exchane_name)

# === Sending request

puts "Trying to send to '#{exchane_name}': #{request.inspect[0..120]} by #{routing_key}"

request_exchange.publish(JSON.generate(request), :key => routing_key)

puts "Sent to #{routing_key} | #{request_exchange.name}"

# === Handling result

finished = false

queue_result = result_channel.queue("", auto_delete: true, exclusive: true, durable: false)
queue_result.bind(result_exchange, routing_key: request_id)
result_consumer = queue_result.subscribe do |info, meta, payload|
  response = JSON.parse(payload)

  puts "Got: #{payload}\nfor request: #{request_id}"

  if response['request_id'].to_s != request_id.to_s
    raise "NOOO #{request[:id]} != #{response['request_id']}"
  end

  puts "canceling result consumer: #{result_consumer}" # => is shown
  puts result_consumer.cancel.to_s
  puts "finished" # => UNATTAINABLE!!!

  finished = true
end

result_consumer.on_cancellation do
  puts "on_cancellation has been called"
end

puts "sent: #{result_consumer}" # => is shown

# infite loop
sleep 100 while not finished

puts "Finished"

result_channel.close
request_channel.close

connection.close