az resource list with --resource-type 'Microsoft.Web/sites/deployments' returns no results

### **This is autogenerated. Please review and update as needed.**

## Describe the bug
the list is always empty for any resource-group I try if resource-type is 'Microsoft.Web/sites/deployments'
**Command Name**
`az resource list`

**Errors:**

## To Reproduce:
Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

- Have some resource such as a webapp with some deployments_
- `az resource list --resource-group {} --resource-type 'Microsoft.Web/sites/deployments'`
the result is an empty array

## Expected Behavior
the same list of deployments visible in the portal or in the https://resources.azure.com/ viewer
## Environment Summary
```
Windows-10-10.0.19041-SP0
Python 3.6.8
Installer: MSI

azure-cli 2.16.0

Extensions:
application-insights 0.1.3

```
## Additional Context