Using Bicep module output as input for another module

[lem-helbling]

Describe the bug
When using a Bicep module output as an input for another Bicep module, whatif will not detect any changes. Neither additions nor modifications are shown in the list.

To Reproduce
Steps to reproduce the behavior:

1. Run the deployment of the main.bicep file (see below) with whatif enabled
   az deployment group create --resource-group <resource-group> --template-file main.bicep -c
2. The change list will not include the service bus as a new resource

File main.bicep:

module module1 'module1.bicep' = {
  name: 'Module 1'
}

module module2 'module2.bicep' = {
  name: 'Module 2'
  params: {
    input: module1.outputs.out
  }
}

File module1.bicep:

output out string = 'my-output'

File module2.bicep:

param input string

resource serviceBus 'Microsoft.ServiceBus/namespaces@2018-01-01-preview' = {
  name: 'Service Bus'
  location: 'westeurope'
}

Expected behavior
The service bus should be listed as a resource to create.

Client
CLI

[alex-frankel]

This is a dup of #157