Error: No match found for 'postman2', available gists

When I tried to create a project with following command:
x new web MyApp && cd MyApp && x mix -f auth auth-dynamodb autocrudgen cors openapi postman2
It generates the project, but the command output says:
No match found for ‘postman2’, available gists:
Looks like the gist is missing.
My env is:
x --version
Version: 6.0.1
ServiceStack: 5.133
Framework: .NET 6.0.0-rtm.21522.10
OS: Unix 11.6.2

It’s because we’ve upgraded ServiceStack.dll to include Postman to v2 so mixing postman2 gist isn’t unnecessary.