Cannot delete permissions referencing security groups in another VPC

[eagletmt]

Suppose there's a permission referencing security groups in another VPC.

ec2 'vpc-xxxxxx' do
  security_group 'sample-x' do  # sg-xxxxxx
  end

  security_group 'test' do
    permission :tcp, 80..80 do
      groups('sg-xxxxxx', 'sg-yyyyyy')
    end
  end
end

ec2 'vpc-yyyyyy' do
  security_group 'sample-y' do  # sg-yyyyyy
  end
end

When I try to delete some of them, it fails unexpectedly.

ec2 'vpc-xxxxxx' do
  security_group 'sample-x' do  # sg-xxxxxx
  end

  security_group 'test' do
    permission :tcp, 80..80 do
      groups('sg-xxxxxx')  # Revoke sg-yyyyyy
    end
  end
end

ec2 'vpc-yyyyyy' do
  security_group 'sample-y' do  # sg-yyyyyy
  end
end

% piculet -a Groupfile
Apply `/path/to/Groupfile` to SecurityGroup
Delete Permission: vpc-xxxxxx > test(ingress) > tcp 80..80
  revoke sample-y
[ERROR] Can't find SecurityGroup: 012345678901/sample-y in vpc-xxxxxx

It seems normalizing security groups to their name isn't a good idea for cross-VPC permissions.