demonstrates the problem described at: gruntwork-io/terragrunt#1376

Following the description given at for passing outputs between modules, I have the following:

root
├─ terragrunt.hcl
├── backend-app
│   ├── main.tf
│   └── terragrunt.hcl
└── mysql
    ├── main.tf
    └── terragrunt.hcl

The terragrunt.hcl in the root folder only contains the remote_state configuration:

remote_state {
  backend = "azurerm"
  config = {
    resource_group_name  = "XXX"
    storage_account_name = "XXX"
    container_name       = "XXX"
    key                  = "${path_relative_to_include()}/terraform.tfstate"
  }
}

For backend-app I define a variable called environment and the the following dependency:

include {
  path = find_in_parent_folders()
}
dependency "mysql" {
  config_path = "../mysql"
}
inputs = {
  vpc_id = dependency.mysql.outputs.environment
}

Now I would expect the following to work:

cd root
terragrunt apply mysql
terragrunt apply backend-app

...but I get a prompt asking me for the value of environment (Note: I'm starting `terragrunt from within the root directory)

In my experience this only works when I do the following:

cd vpc
terragrunt apply
cd ../backend-app
terragrunt apply

Note: I'm always changing into the module folders and start terragrunt from there.

Is this correct, is this expected or am I doing something wrong?