`stellar contract invoke --cost` is not working

[fnando]

What did you do?

$ stellar contract invoke --cost --send=yes --id hello -- hello --to 'fnando'
ℹ️ Signing transaction: da92da9ab506d9725380b57fe40b9aacdd05cd62cca005b28ff1a05e15c04291
["Hello","fnando"]

What did you expect to see?

The cost, as advertised by the help.

$ stellar contract invoke --help | grep cost
      --cost
          Output the cost execution to stderr

What did you see instead?

No cost output.