The secrets: section in the included runbook is not working

[k1LoW]

# main.yml
steps:
  -
    include:
      path: include.yml
      vars:
        secret: "this is secret"

# include.yml
vars:
  secret: 'dummy'
secrets:
  - vars.secret
steps:
  -
    exec:
      command: echo '{{ vars.secret }}'

$ runn run main.yml --scopes run:exec --debug
Run "include" on "Generated by `runn new`".steps[0]
Run "exec" on "Generated by `runn new`".steps[0]
-----START COMMAND-----
echo 'this is secret'
-----END COMMAND-----
-----START STDOUT-----
this is secret

-----END STDOUT-----
-----START STDERR-----

-----END STDERR-----
.

1 scenario, 0 skipped, 0 failures