In our code we use commands and "subcommands", calling our tool via iobroker object will result in our code processing the command and then calling yargs.showHelp(), the generated output looks like:

iob object
Unknown command "object undefined"!
iobroker object

Object management

Commands:
  iobroker get <id>                                     Get object specified by id
...
...
...

I would expect, that it shows iobroker object get <id> and not iobroker get <id> as it is done when I call iobroker object --help:

moritz@moritz-ThinkPad-E470:~/workspaces/ioBroker.js-controller$ iob object --help
iobroker object

Object management

Commands:
  iobroker object get <id>                                     Get object specified by id
...
...
...

Why is there a difference, is this intended? If yes, how can I achieve the desired output via showHelp()?

You can find the relevant code here: https://github.com/ioBroker/ioBroker.js-controller/blob/12a235299be58d7bb4592d71d61478afe9f1797b/lib/setup.js#L34-L370