Custom-ui not show when I use validator function in manifest

Forge Forge Modules and Product Triggers
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1

Hi I have this manifest:

modules:
  jira:workflowValidator:
    - key: my-workflow-validator-custom-ui
      name: My Validator
      description: A Jira workflow validator
      # function: validate.   # uncomment to use
      expression: "'1' === '1'"
      view:
        resource: custom-ui
      edit:
        resource: custom-ui
      create:
        resource: custom-ui
  function:
    - key: validate
      handler: index.handler
resources:
  - key: custom-ui
    path: static/custom-ui/build
permissions:
  scopes:
    - manage:jira-configuration
    - read:jira-work
    - read:issue:jira
    - write:issue:jira
  content:
    styles:
      - unsafe-inline
app:
  runtime:
    name: nodejs18.x
  id: <myid>

I use manifest in this way, custom-ui appears as step when I add my-validator in workflow, but validation is always true for the expression that I put in manifest, now I want to have a api call in the validate function for my reasons (validation needs some jira api check to validate the trasnsition), so if I use function instead of expression, the api that I call in the validate function in my index works fine, BUT the custom-ui doesn’t appear anymore when I add my-validator in workflow.

Someone can help me?