azure-cli: WebApp:az webapp config backup restore fails

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Describe the bug

Command Name az webapp config backup restore

Errors:

The command failed with an unexpected error. Here is the traceback:
'WebAppsOperations' object has no attribute 'restore'
Traceback (most recent call last):
  File "/opt/az/lib/python3.6/site-packages/knack/cli.py", line 231, in invoke
    cmd_result = self.invocation.execute(args)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 657, in execute
    raise ex
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 720, in _run_jobs_serially
    results.append(self._run_job(expanded_arg, cmd_copy))
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 712, in _run_job
    return cmd_copy.exception_handler(ex)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/command_modules/appservice/commands.py", line 37, in _ex_handler
    raise ex
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 691, in _run_job
    result = cmd_copy(params)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 328, in __call__
    return self.handler(*args, **kwargs)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/core/commands/command_operation.py", line 121, in handler
    return op(**command_args)
  File "/opt/az/lib/python3.6/site-packages/azure/cli/command_modules/appservice/custom.py", line 1840, in restore_backup
    return client.web_apps.restore(resource_group_name, webapp_name, 0, restore_request)
AttributeError: 'WebAppsOperations' object has no attribute 'restore'

To Reproduce:

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

• First you need to create a web app backup
• az webapp config backup restore --backup-name {} --container-url {} --resource-group {} --webapp-name {}

Expected Behavior

Backup should be restored.

Environment Summary

Linux-5.4.0-1058-azure-x86_64-with-debian-10.2 (Cloud Shell), Common Base Linux Delridge (quinault)
Python 3.6.10
Installer: DEB

azure-cli 2.28.0

Extensions:
ai-examples 0.2.5
ssh 0.1.6

Additional Context