[MM] `[unknown-primary[object]]` appears in `properties`

I am generating `api.yaml` file using `autorest.cli` with input file: `azure-rest-api-specs\specification\compute\resource-manager\readme.md`

# Tag in use
`package-2019-07`.

# Cli section added in `readme.md`

``` yaml $(cli)
cli:
cli-name: compute
azure-arm: true
license-header: MICROSOFT_MIT_NO_VERSION
payload-flattening-threshold: 2
namespace: azure.mgmt.compute
package-name: azure-mgmt-compute
clear-output-folder: false
debug: true
disable-azure-cli: true
```

# Problem encountered

In the generated `magic-module-input` files `computevirtualmachine`, some properties are generated as:
```
- !ruby/object:Api::Azure::Type::[unknown-primary[object]]
name: 'settings'
description: 'Json formatted public settings for the extension.'
required: false
azure_sdk_references: ['/resources/settings', '/resources/properties/settings']
- !ruby/object:Api::Azure::Type::[unknown-primary[object]]
name: 'protectedSettings'
description: 'The extension can contain either protectedSettings or protectedSettingsFromKeyVault or no protected settings at all.'
required: false
azure_sdk_references: ['/resources/protectedSettings', '/resources/properties/protectedSettings']
```