When creating an ACF and setting the rules as:
Show this field group if:
User role is equal to ROLE
The ACF field isn't queryable through the viewer (when authenticated). Here is an example query :

query getViewer {
  viewer {
    id
    username
    name
    userId
    myacf
  }
}

This returns this error :

{
  "errors": [
    {
      "mess